The first T1 is going from 3745 with external Adtran TSU -> 3725 with integrated T1 card V2.
The second is going from 3745 with integrate 2 port T1 card -> 3725 with integrated T1 card V2.
Totally separate circuits, 4 different cities. Both are using the same carriers. However, there are other circuits attached to all 4 routers that are not bouncing. 3 are running code 12.3.8 the 3745 with external Tsu is running 12.2.13
These issues are always the strange ones and range from weird things like janitors unplugging things to vacuum to backup power recycling. I would open a ticket with both carriers and have them get the local loop provider involved to determine if there is a wiring issue.
Another thing you might want to try, if you have another router, is to move one T1 to another router and see if the behavior continues on the new router.
Don't change too many things at once, if you do and you fix it you won't know which change fixed the issue. Good luck!
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