TERRIBLE SIBILANCE!!

[Trebor]

Also, another problem has started when recording, sometimes (in this recording also) it’s very glitchy.
Is this mainly because of my computer power? Or can it be other reasons

Fixing the sibilance is the easy part, e.g. using Steve’s de-esser plugin …

The glitchiness, aka drop-outs, aka skipping, is a far worse problem.