ASA 5505 - Internet connection randomly goes down

I have a 5505 in a small office and everything works well except for a few times a day the office will lose the internet connection then it will come up a few seconds later. It happens randomly a few times a day. For testing when a user is directly plugged into the ISP modem this never happened. We even replaced the 5505 with another one and the problem returned. How can I see when and possibly why this is happening? I am not inspecting http traffic and the pings time are really good to and from this asa to the main office.
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tolinromeAsked:
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JohnBusiness Consultant (Owner)Commented:
I use Cisco but not that model. Have you tried updating the firmware in the Cisco router?  Is it being overloaded with requests and traffic.
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A KarelinCommented:
I agree John. Try to change ios. We have some problem with Internet connection and vpns and we are going to change ios to another version.
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tolinromeAuthor Commented:
ios is very updated, not overloaded with requests at all, great hardware specs, etc.
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JohnBusiness Consultant (Owner)Commented:
For testing when a user is directly plugged into the ISP modem this never happened

So it is not the ISP according to the above.

Try a hard reset of the ASA 5505 to factory specifications and do a minimal setup. Test this.

Do you have an AC power supply issue (erratic, insufficient, or too high voltage). Is the enough current capacity to power everything.
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bominthuCommented:
If it happens few times a day, should be easy to troubleshoot.
I would suggest to enable logging in ASA.
Configure to send logs to local SNMP server

When user says internet down, troubleshoot one by one.
1. Ping FW inside IP from user machine - ?
2. Ping from different machine - ?
If 1, 2 fail, connect FW inside interface directly to your laptop and ping.
If you can ping directly from your laptop, then access CLI, ping 8.8.8.8 from console
From above few steps, at least you can be closer to find out the root cause.
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tolinromeAuthor Commented:
Looks like its the vpn peer ip in the tunnel.
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tolinromeAuthor Commented:
Looks like its the vpn peer ip in the tunnel.
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