Q: 2012 Time Capsule continuously disconnects

Hi,

I have a Time Capsule which is wired to a router provided by my internet provider. I have also a 2011 Airport Express which is wirelessly connected to the same router which works without any problem.

I've tried several strategies, connect wirelessly TC to that router, downgrade the software, wired to the router - everything led to the same result - TC continuously disconnects and is not recognized by Airport Utility. The only solution is to turn on/off TC and everything starts working normally.

I have my iTunes Library on this TC drive so when it happens I have to wait for several (dozens) minutes in order that iTunes verify the Library (do I have to point out how annoying this is).

So my actual configuration is TC is wired to the router, latest software upgrade 7.6.7, and the frequency of this disconnection is very random (sometimes it works for a week, sometimes even a month, sometimes it's every two days).

I've tried to follow some of solution find on internet by nothing helped.

Thanks in advance for your comments and suggestions,

Sharlo