Urgent help needed - needle position

I have to DJ on friday and got a problem. I work with hot cue's and had the problem that the needle used to jump to the original needle position, this got fixed by changing to all relative, but now the needle changes to the next hot cue marker
I've also noticed that after playing for a while the quality gets really bad (0-20% quality) and i have to turn open the tone arm and lick the tone arm connection - this is the ONLY way the quality goes back to normal, just opening and closing the tone arm doesn't work as some say.
What is the problem and how can i fix it?

I've also noticed that after playing for a while the quality gets really bad (0-20% quality) and i have to turn open the tone arm and lick the tone arm connection - this is the ONLY way the quality goes back to normal, just opening and closing the tone arm doesn't work as some say.
What is the problem and how can i fix it?
