Damaged sound and maybe RAM problem. Help

Hello All,
I can't find a similar post, so i decide to open a new.
Okay here's what has happend with my mpc 2000 XL: Last times when i load PGM & SND when it's done, after
(for example) 15 min working a sound goes damaged. I mean still hear a samples but cutting and with some drops. When I went to Turn off/on a MPC and try to loading a sound again it give mi report: Not enough memory. Somethimes this "sickness" is two days. I trying to format, install a new OS 1.2 but it still dosen't work. In addition when I check a digital inputs I hear that drops and cuts and see it on screan Level Meter.
Probably I think that could be a some Internal memory problem, because it's like RAM damaged and blockade.
Is only SIMMS boards directly ressponsible for RAM capabilities? Change that isn't a problem.
How do you think?
Anybody have the same problem and also willing to help me figure out why this happens?
I'm really stuck with this.. :(
Sorry for my English : )
Greetings

Saying not enough memory when you immediately turn it on is no good.

Yes, changing the SIMMS should eliminate any RAM problems.

Use 2 * 16mb sticks or 1 * 32mb stick.

Hopefully that fixes your problem.

Hi,
Thanx for response,
Yes, I think that may be help as well, but I'm fear for this drops & clicks in digital and analog inputs. Yesterday I was trying to record something via mic and in result I heard only cracks. Trim view was very interesting
Cheers

Thats how the machine react if the RAM is damaged or having contct problems. I hd this problem when I got my 2000 and the seller said "full RAM" but I couldn't sample more than a few seconds without distorting shit and crackling comming out of the speakers. I opened it up, took out the RAM, cleaned the contacts with isopropyl liquid (I ususaly clean vinyl with) and put it back in. waited a few minutes till the contacts were really dry and had no problem with the RAM since then.

peace

Great Thanx Peter,
that was very useful. I will try this "high % specyfic" ..and maybe don't need to searching for new RAM sticks
Peace & Good luck