stepper or drive problem

I think my problem could be contributed to drives getting too hot. I am going to build a positive pressure temp controlled box to house my computer, power supply, and drives and shield the drives from the power supply a little better than they are now. This will get them out of the heat and dust of my shop. Also, when I finally got everything up and running, I never really "finalized" the wiring, etc. Need to just shut down and finalize everything. It's been running well. I'm fairly new to CNC machining but have used it most days for the past year, a couple hours a day and I have yet to even break a bit. Destroyed a lot of work pieces (shouldn't say destroyed but more... unsatisfactory results) but that is mostly due to the learning curve with my cam software. I'm using Aspire now and I love it. I've spent a lot of time watching videos & learning autocad, Aspire, and ecabinet software...need to spend a little more time with Mach. Thanks for the help.
--Rick