TCL F40b3803 TV: Sound Cuts Off After 20-30 Minutes, Updating Software Didn't Fix Issue

Hello,
I have a TCL F40b3803 TV set. For some time the TV started to cut off the sound. More precisely, after starting everything works nicely and after about 20-30 minutes the sound breaks continuously - as if it "frames" the sound, you hear jerks, sometimes it completely mutes for about 1-2 seconds.
I tried HDMI connections, "Euro connector" and still the same.
I bought a used TV set, so it has no warranty. I've been using it for about 3 months - the problem has been around for 2-3 weeks.
I updated the software from the manufacturer's website, but that did not solve the problem.

Have any of you experienced a similar condition? Can anyone determine what the problem may be?

Thank you in advance for your help

Hello

I have the same problem whether you coped.
greetings
Peter

Added after 34 [minutes]:

TPA3110D2 power amplifier to be replaced

I gave the TV to a friend who had much more knowledge than me. From what he gave me, he replaced all the capacitors on the power supply (total cost about PLN 50 - from what I remember). Currently, the TV is working properly - so rather an accurately diagnosed cause.

I hope it can be fixed as well

And yet a mistake - replacing the C138 did the trick

Added after 1 [minutes]:

Power system ???? monolith capacitor for surface printing, that is, the cause of sound breaking, etc. ailments.

Added after 2 [minutes]:

There is a / capacitor / near the power amplifier and heating with a hot air fooled me a bit.
It can be removed and nothing is mounted
But it's already OK
greetings