Tannoy HTS101xp subwoofer keeps resetting

[BossDrum]

Hello

I have a Denon AVR-X2300W with the Tannoy HTS101xp speakers.
All working fine for a few years, but now the subwoofer has starting behaving weirdly.
I get a loud thump from the subwoofer and it seems to completely reset itself (the LED on the back of the subwoofer goes off).
This happens maybe 2 times a day, so not that often.

On the Denon, speakers set to small, crossover= 100hz. LPF for LFE= 120hz
Tried plugging the sub into the other output on the amp, same issue.

The only changes I have made was to move the whole setup into another room onto an different TV.
Any ideas anyone???

 

[dobrykamil]

Does your sub is TS2.8 model?

 

[BossDrum]

Does your sub is TS2.8 model?

Yes that's the one.

 

[dobrykamil]

This thread will be useful, because your sub comes with the same built-in amplifier. 99% the fault is related to standby power supply caps.