Could be bent or out of whack. Always check your gear mesh, it should have a bit of play between the gears. If you stuff them in there it's not only a lot of friction but a heavy load on your motor and can cause damage over time. Definitely check it but for bent or damaged parts. Everything they...
I will second and third what @coldvod said and add to that
Let it cure for 24 hrs at room temp.
Just drop will work. Too much is a bad thing.
Use heat and good tools every time you need to break it loose.
I use blue thread lock (not as strong) but I also check it regularly and do shorter speed...