Cisco Phones Losing connection every 10-15 Minutes after 3750-X install

We just installed a new 3750-X switch and everything is working except that the phones will lose connectivity every 10-15 minutes. If someone is on the phone, the call will go dead for 3-5 seconds and then continue. The config is attached. The router is connected to G1/0/26.

Just to be clear, it must be the switch because everything was working before this was installed.
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Patrick BogersDatacenter platform engineer LindowsCommented:
Please follow this link which Will guide you through troubleshooting POE.
JesusFreak42Author Commented:
It's not a POE issue, the phones are all on. It just comes up saying "Cisco Unified" every now and again, which usually means that the phones has lost connection with the server.
José MéndezCommented:
I would love to think its a POE issue, however, since you describe phones loosing audio for 3-5 seconds and then resuming by itself, it just can't be a POE problem. The phones would hard reset and never be able to recover that call.

Here is something super easy to try out:

Negate all the QoS commands on one switchport. Leave just the

spanning-tree portfast
switchport voice vlan 31

commands, and monitor a phone for half an hour.
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put a phone on a POE brick just to rule out the POE issue

have you checked your uplink?  set it to Full duplex
JesusFreak42Author Commented:
I put it on port 45 and it is not connected at all. Should I post the config for one of the switches it was plugged into before? There seem to be some qos and other differences between the two.
JesusFreak42Author Commented:
Well, here is the old switch config. The router was plugged into 22(for vlan 31, and 23 (for VLan 1,
JesusFreak42Author Commented:
Ok. Here's some clarification.
1) The time on the phones is about 30 minutes off when they "disconnect." They also display "Cisco Unified CME" on the screen instead of the usual dialog ("Options").
2) There is a fast busy signal when trying to call outside numbers
3) Inside extensions seem to be able to be reached (these are the calls that people have made that get the voice drop outs).
4) It happens more than every 10-15 minutes. More like every 3
Alex BaharCommented:
Can you enable logging and post it to here? The log might tell what is happening every 15 minutes.

Which port is your uplink? If it is gi 1/0/25, then can you remove everything but only configure the trunk port specific stuff:
switchport trunk encapsulation dot1q
switchport mode dynamic desirable  or trunk

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JesusFreak42Author Commented:
Ended up being an ISP issue.
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