Driver side window..
 

I have a 2002 TL Type S... There's a issue with my driver side window in summer months only... Anywhere from 70 to 85 degrees in heat my window works find rolling up and down... Any temperature higher than that it gets a mind of its own and starts going up and down ... There is a constant rattling/click sound in the door panel when this is happening... Sometime if i press the switch the window moves other times no response...

Is this a regulator motor issue or could it be a bad master switch.?.. I do not want to waste money buying parts I don't need.. And this issue only happens in extreme heat like 89 or above.