Hi. Any make in particular? About how long they last in owned time and what is your average weekly usage in hour? Can you also try to be very precise in telling me how you handle the discs gesture by gesture from picking it to play up to putting it back on the shelf.
Also, is it doing this only with disc you recorded while original matrixed disc play fine?
You did not mentioned me the time you owned them. After around 2 years, capacitors can go bad (this problem never was fixed in anything because they use it as a common planned obsolecence trick).
You need to clean only with isopropyl alcohol, nothing else as it leave residues. You can try to clean the head sliding bar and also the spindle (the part that hold the disc while it turn).
If those where re-writable disc, those are all unreliable (DVD-RAM ones where good but unpopular so not all unit are compatible with them)
There is also a bunch of compatibility problem that often require firmware update (when companies even bother to produce one).