Any slight abrasion weakens ALL line.
Flourocarbon have its flaws but it comes down to tying a Palomar knot (not overlapping lines), a Double San Diego Jam, etc. If you moisten your line when tightening, check your line periodically like you do with all lines, then you shouldn't have issues. But yes flourocarbon does have its weaknesses like all lines.
Instance think the issues could be from buying non legitmate line such as buying from a website or company named Save A Lot,etc. Not moistening your knot when tightening down. Not tying a proper knot with flourocarbon. Try tying a Double San Diego Jam. Also, periodically change/check your line. Do not leave your gear/line outside. All these should minimize issues.