I've noticed that when a melee character reaches 35 dex, their combat timer essentially disappears and they swing repeatedly with no delay. When they enter this 'looping' you can also no longer interrupt/change their attack, nor can you effectively control other characters.
Of course, this makes the party pretty much immortal as monsters can no longer swing back before they are all dead, unless you are *seriously* outclassed, and even then it would have to be multiple groups of mobs.
I noticed this effect with 2 Samurai at the front of the party, one with 36 Dex, one with 34 Dex (the one with 36 exhibited the loop, 34 did not). When the second Samurai leveled up and hit 35 Dex, he started bugging out the same as well. I haven't tested it with any other classes, but it should be possible to roll up an elf, gnoll or hobbit charater and have them at 35+ Dex right out of the guild, depending on class. Very exploitable if that's the case. I'll try to do a little testing and send more info.