When i looked in the morning…overwall percentage was at 91,7%…then i turned off my pc. i camed home..turned on..and i saw that it was at 47,7% what the f*** is happening??? happened twice till now! if u can’t fix this damn problem,don’t release program…
Calm down…
Are you using, by chance, the latest STABLE version .70??? 
If not, how about providing that info, for starters… ?? 
please not that if you do not close bit comet properly it can lose all the data it had downloaded in that session. this can also happen rarely when connection is lost. that is why when you are around it is wise to close bitcomet and re open it agsain every few hours. its almost like saving your work, then if it crashes you are much less likely to lose any data. also doing this clears cashe use thus reducing cup useage. (maybe cus’ is wipes the tempory info it was keeping whilst downloading and saves it to hard disc? i dunno im just guessing)