Question: How often do you roll and how many times have you rolled? Do you use molly or pressed pills? Where do you get it, from shady random dealers at raves or from a trusted dealer? Also, do you use any other amphetamines, phenethylamine, psychedelics or other stimulants frequently?
If you roll often or too many times, you will lose the magic real fast and then all your rolls will just be speedy.
If you use amps and other stims often or have a tolerance, this will also cause a cross tolerance to MDMA.
If you buy shady pills from shady dudez, you're probably getting shitty drugs. I made that mistake this past Saturday. Friend bought molly from a last-minute dealer someone who knew someone who knew someone who referred him to this guy. Ended up being the worst roll ever and actually has me questioning if it even was MDMA at all.
Whether you use molly powder or pressed pills, it still poses the same risk, however, I've heard of many more cases of severe cuts in pressed pills. To my understanding, nearly half of all pressed pills that get seized contain no MDMA at all. If you buy molly powder, chances are that you're at least getting some MDMA, even thought it could also be heavily cut with other stuff. However, again, you could have an experience such as I had with powder. All other times I had powder, though, I've rolled face on 100mg every time.
If you've been buying from the same source all along, I'd say it's time to switch dealers. You're probably getting ripped off if this is the case.
Hope it helps.