Grundig A5000 left channel noise

Hello, I have Grundig A5000. I have a problem with left channel. When plays music, the left channel makes noise, cracking...But nly at start listening. So I opened it and check solder connections and re-solder all transistors to be sure. I pu it back together. I turned it ON, the left channel didnt work, almost no sound and after one, two switched on/off, the left channel is back to its original state.. makes little cracking... But only in the beginning listening... After a few minutes or an hour the musc sounds goog, I think..

Anyone have an idea, please? Possible bad transistors...?

Here is the link on youtube: https://www.youtube.com/watch?v=_dOPi9vwYpo

And this is worst case, loud cracking from left channel: https://www.youtube.com/watch?v=V6HuxuOLQGI