My car slips out of gear athigh speeds or wheni am stuck in traffic. What is th on 1996 Toyota Corolla

My car never slips out of gear other wise and it has only happened twice ever. The clutchis not the problem and i am thinking it might get too hot and that is when it slips out of gear. Any feedback would be appreciated...

Asked by for the 1996 Toyota Corolla
I assume it is a standard shift. if it popps out of gear, it is in the gear box. a syncro may be worn and popps out under certain conditions. it will require removal and replacement of the bad parts. it will get worse over time.