@Silvia80 Your experience is fairly well known in educational circles. Taking time away often helps the learning process as it seems to allow the brain to sort things out so that when you come back to it, it feels easier and you don’t have the subconcious pressure of messing it up. It also works by going away and doing something different, either a different guitar technique, musical piece, or something non-musical entirely.
Even just switching out items in a practice routine seems to work, at least for me. If I’m having trouble with a chord change or passage of music I replace it in my routine for a few days, then it just seems easier when I bring it back. It just seems easier somehow, rather than struggling on and not making any progress.