Hi Gohste.....Firstly, I havn't serviced it for comming up to 2 years (very bad I know)....The main prob is two of the channels have the exact oppisite problem....
One won't work on startup, but slowly slowly starts to kick in when the machine warms up, I'm talkin' after about 1/2 to 1 hour...
Another channel does the opposite, it's fine at the beginning then slowly loses playback (NOT recording)....The signal gets progressivly weaker untill it sound very weak and all topend stuff....
Appart from that it just needs a good service and I think a relap is about in order....