Imp still running but very hot

Hello everybody!

I have recently bought an electric imp 001 with a sparkfun breakout board.
I haven’t used it much and only powered it with a USB power supply.

Now i have bought alot of hardware for a project and i wanted to get familiar again with the online eIMP IDE.
So i powered it again with USB and after a while i have noticed my IMP is getting very hot!

It still runs and i can program it but i am a little bit scared that it is gonna die real soon.

What are your experiences with the imps temperature?

Do you have a voltmeter? Make sure 3.3VDC is still 3.3VDC

None of my imps are even warm, so hot is not such a good thing?