Manual transmission jumps out of 5th gear

5th gear slips into neutral
manual transmission pops out of 3rd gear
5th gear slipping
manual transmission pops out of reverse
manual transmission pops out of gear while driving
manual transmission pops out of 4th gear while driving
manual transmission pops out of first gear
how do you fix a manual gear popping out of gear?

External issues can be linkage problems or mounting problems. Linkage problems are easy to diagnose and can typically be duplicated. Worn engine/transmission