Found the tape when it started with pixelated lines. It happened when I visited a beach visit Brazil. After 47 min the recording suddenly had pixelated lines. Maybee sand. Unfortunately, I did not clean with a cleaning cartridge.
Is there a program that can improve/reduce the pixelated lines on the material I transferred to the PC?

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Maybe lordsmurf or latreche34 knows? I redad about aligning the head to get rid of the artifacts/pixelated lines. Is that a good idea?

As mentioned the camcorder works great with all tapes except for tapes recoded in 2001. If I mess with the head alignment maybe the camcorder won't work with any tapes?

Not that I know of, Once the pixels are gone, they are gone, software interpolation exists at frame by frame level for historic and rare materials and very time consuming if you want to go that route but the results depend on how much damage or lost details you start with.

Miss aligning the camcorder works only if the entire tape is recorded with a misaligned camcorder, not in this case. If the these tapes are important to you, see if you can send them out to someone with better hardware, maybe he can get better extraction than what you have. Some hardware have better error correction than others, or heads are in better shape.

What about rewinding and fast forwarding a couple of times, can that improve quality if it gets rid of oxilated layers?

Try it, It may get worse though if the magnetic coat is not stable.

I didn't work. I tried to rewind and fast forward three times. The playback didn't change, still pixelated lines.

Out of 220 MiniDV tapes 27 tapes had pixelated lines, the others worked fine. That's 12% of the tapes that had problems.

Software interpolation is nothing I will try. Sending the to a professional firm won't happen as it's way too expensive.

If somebody has any bright ideas, please tell me.