Hi.
The topic says it all, more or less.
This may not seem like a big issue when playing with a full party, but for solo play one has to rely on making the enemies do the dirty work. However, it seems that if your main character is not directly attacking someone (AoE effects do not seem to count either) the combat will reset after a brief period of time, canceling all buffs and / or effects.
It's really frustrating to have Whisper of Treason charm an ogre druid for 15 seconds, and have it reset after 5 seconds because you were casting buffs in the background.
/rant