Computer running really fast - eats up battery

I am having a problem with my mac every Monday - It begins to run very fast and the fan starts running and then what was a full battery (5+ hours) drains to 1 yo 2 hours and the entire computer slows down. Could there be a program set to run at this time every Monday - if so what would it be? It happens at the same time every Monday! Should I just take my computer in to be looked at by the Bar and see if they can figure it out. Also I am getting a whining from the speakers (I assume) everytime I bring the computer out of sleep mode or turn it on. It is a high pitched squeal that is quite annoying - what can I do about this and what is it?

Be sure when you check Activity Monitor to pick all processes so you can be sure to see what all is running.

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