I'm also having the same problem, also when a potion's effect ends it drops things on the ground at random. I was not very lucky also with the honesty of people around, I got robbed ... This is extremely annoying and I think I'll stop playing for a while because I don't play to get mad after bad people. This sack problem is also a problem to RP, because when you start wondering about technical issues, RP stops.

I think that in case of weight issues; movement could be extremely impaired, maybe until any move is impossible, but the player should be able to decide whether he will drop something, trade it or drink a potion.

 Have fun, I'll check in a few month if the bug's gone,