I'd bet my last dollar its got nothing to do with them dropping or raising speeds
Its just the demand at the time on the individual server the file is on
either has free capacity or it doesnt
If too many free & premium users(unlimited) are requesting too much all at once you get
outages , waiting times & slow speeds on some servers.
EDIT - one other possibility
A very good point made in the 1fichier thread by Jenny48459
which is similar to file factories MB allowance
Gives free downloaders premium speeds for awhile based on a different formula than bandwidth consumption
http://vintage-erotica-forum.com/sho...&postcount=416