So it happened a couple times before during fall and spring but now is really driving me nuts. My rear window (driver side) works perfectly when it is cold outside but when temperature rises (like today 70 degrees) it doesnt go down, i didnt have problems during last summer when the temp was around the same everyday (over 90 degrees)

The damn thing just wont go down, the motor doesnt whine or grind, i just hear a little click. Then at night gets cold and boom the window works fine. What do you guys think? new motor???? or something else and what the hell does the temperature outside has to do with it???