This can be caused by part cooling problem.
If you notice the overhang area of your part is very rough, the support are stuck too firm on the actual part and hard to be removed, this could be:
1) Part fan not strong enough, or only at one side
Upgrade to a 5015 radial part fan or modify the fan duct will help.
2) Part fan broken
Replace one will fix. Fan can be found at our shop.
You can see “What modification have we done to our 3D printers” to get the idea of the part fan modification.
Share with us in the comments what issue causing your 3D printed part with the similar problem and how you fix it.