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Printer stops working the 2nd day

I have two multifunction printers that after the 2nd day, they both stop working.

This is a small home network.
The wifi router is built into the modem,

I have tested with a PC and a MAC, and same issue occurs.
Printer 1: Brother MFC-L2750DWXL
Printer 2: Canon MF8330CDW

So I made sure both computers have the newest drivers installed, the PC and MAC.
I configured the printer on the wifi and it connected fine.  I printed from both computers, worked fine.  The next day, both the PC and MAC won't print to the Brother printer.  
I restarted the printer, and still doesn't work.  I was thinking it's a sleep setting, but after the printer has been restarted, it's not asleep anymore, so it should have worked.

Any suggestions in what else I can do to identify the issue?  

I guess I can replace the wifi router with another one and test to see if that is somehow blocking the traffic?

I even used a USB cable, plugged it directly into the printer and it still doesn't print.

This is weird, specially to happen to two different printers, different brands.
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arnold
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I thought I had some ideas until you said that USB printing was also not working. To verify, when you try to print via USB, are you using a separate printer (in the dialog that lets you choose your printer) that was set up connected to USB, or the same printer that didn’t work over the network? If the latter, then your test isn’t determining anything.

Other than also not being able to print via USB, your problem seems consistent with your printers changing their IP addresses, but your computer still trying to print using the IP addresses the printers had when they were set up. The manufacturers have utilities to keep these IP addresses synchronized, but I have experienced other situations where this hasn’t worked. Instead of debugging these utilities to try to get them working, I have found that the easiest way around this issue is to give each printer a static IP address. The simplest approach is to use your router to reserve/specify an IP. For that you need to log into your router, go to its DHCP configuration, and pair the MAC address of your printer to an IP address that is within the range of addresses managed by the DHCP server in your router. The other approach is to use the network set up menu on the printer to choose to set up with a manual IP address, and specifying an address manually, keeping in mind that the number for the last octet in the address should be outside the range that is managed by the DHCP server on your router. Hopefully, once you set up the printer on your computer again with the new IP, it will remember it and use it consistently, solving your problem.  If this doesn’t solve your problem, then no harm is done in using static IP addresses, and you can always go back to dynamically assigned IP addresses, if you so choose.
Arnold, can you please elaborate on what a "BR identifier" is?
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Gary, yes, I configured the IP as static on the brother printer, but it's still doing the same thing.
I have to check, maybe it didn't save it, weird what is happening.
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Gary,  that's the problem, the user has no access to the router, so I can't see anything on the router.
I will bring a temp wifi router that I can manage and try to set that up and test with that.

I reinstalled the printer driver, but it was wirelessly I believe.  It prints via USB the same day when I configured it, but the next day, the user was not able to print via wifi or usb cable.  I had the user restart the printer and use a USB cable and they still can't print to it.  I'll see when I can take my wifi router and perform some more troubleshooting.
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something with the IPS's modem/router.  I replaced it with a Dlink and wifi printing works now, even the 2nd/3rd day.
I did also make a change to the printer, I disabled sleep mode, but I don't know if that has anything to do with it, because even after the the printer was physically powered on, wifi printring would not work.

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Thanks everyone for your help!!!!!
When you mentioned that the printer used to sleep, it reminded me of another possible issue. I read some other posts which suggested that if the printer sleeps past the end of the router's DHCP lease for the IP address that this could cause connectivity issues. In your case there is no lease, since the printer's IP address is static, however, the router still contains tables of IP addresses and DHCP entries, in order to know how to switch signals from one port to another, and entries are purged from those tables when they are stale. I assume that once a table is full the router would erase the least recently used entries to make room for new ones, and the least recently used entry might be the printer if it is sleeping. In my own situation, I have a printer that sleeps for weeks at a time, but I don't have any problems to connect to it when I need it. That might be because I use an IP Address reservation in the DHCP table instead of a static IP, and so its address might always be in the table.
A sleeping printer means it reduces power use, the network is still maintained and should be pingable.
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Good point Gary, I might do that if needed.
As Arnold said, a sleeping printer might still be on the network. After reading his comment I looked at my Canon MX922 printer, and although it is sleeping the blue Wi-Fi light is on. This alleged issue might be printer or router dependent. In the post that I found, the problem went away when the router was changed, but it could be that the new router has different defaults which was the real source of the fix. On the other hand, the fact that you also couldn't print using a USB cable could point to something else. On the third hand, I am not sure you confirmed that you set up the USB test using a Windows Printer that was configured for the USB port.

Anyway, sounds like replacing the router has fixed your issue so I understand if your motivation to diagnose further might be low.
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Gary, yes maybe I should diagnose further, but don't have the time.