Hi guys, I have a small practice amp that I bought back in the year 2000. It has served me well at home, studio and garage practice; sadly, now is behaving strangely. It is a 15W solid-state Marshall combo model G15RCD, in case you have not heard of it, here are some links: Reviews: https://www.ultimate-guitar.com/reviews/guitar_amplifiers/marshall/g15rcd/ Manual: https://www.manualslib.com/manual/99221/Marshall-Amplification-G15rcd.html#manual Although it is a small amp, the volume stays on 2-3 for home practice. It has only one channel, so I set it to crunch and change the gain with the volume controls of the guitar. The problem is that after playing it for a short while the sound starts to go on and off, then the gain goes until it the sound disappears completely. I have to crank it up all the way to 11 so be able to hear a clean sound at low volume. If I stop playing it for a while, it goes back to normal. This does not happen every time I play it, but it does happen with all of my guitars, so it is not a guitar nor a cable problem. What do you think? Can it be fixed? I am quite handy with electronics and I like rewiring my guitars, but I have never worked on an amp before. I have heard on other amps that you can replace the OP amps, capacitors and other parts, but I do not know where to start! I have checked the connection to the speaker and it seems fine, although I will disconnect it and clean the contacts just to be sure. I hope that you can help me on this, I really like the sound of the amp and would be very sad to let it go. Cheers! Walter P.S. If you live in Zürich and want to get together and jam, send me a PM and bring two amps!