5th gear pops out in my manual car?

I was driving today and 5th gear just popped out? 2002 Honda Civic si

I had a Toyota truck that did this. You can try changing the tranny oil to synthetic, it helped mine. Or, a bungee cord to hold it into 5th.

Worn shift forks or syncro. Try replacing the tranny oil. No joy, time for a new tranny.

If it keeps doing it then you need a rebuilt transmission.

There's a bushing at the bottom of the shifter under the car that is the pivot point to the long rod going to the tranny. They seize up and can cause the problem you're having. Take the bolt out and clean and lube the bushing or replace it. You may also have a bad motor or transmission mount that allows the power train to move too much which adds to the problem.