Debuffs don't clear after they expire on you, nor do they clear after you die.
Almost always I get debuffed to hell and back during a fight, especially the debuff that adds 3.5 seconds to your attack delay, then die to the fight after I got those debuffs to a different enemy who also applies a different debuff and just die immediately again. Rinse and repeat and any type of grind becomes almost infuriating. I'm all for debuffs but when they carry over after death it makes the grind tedious and unfun.
Forgot to mention that I noticed the debuffs not clearing on their expiration specifically with the 3.5 second delay debuff. It maintains that speed until the next attack after which it refreshes.