Reply to MR5MKII bass fault?

Recently just bought a pair of brand new mackie's MR5 MKII speakers. So I plugged one of them and played it loud for like 1 hour and then suddenly bass stoped playing and now I can hear only HIGH's frequencies (very silent) coming out of the upper part of the speaker. The second one seems to work properly, but another issue is that they get very hot in just 20minutes (if played out loud). Anyone experienced something similar? What can I do about it?

I already send few messages to the supplier and the warranty.

Thank's a lot!