Serval Player from the Invade and Annex 77th JSOC Public Server 1 on Altis get this Bug very frequently.
So far a workaround on the Server was this:
set Maxmem and maxvram to 2047 and change the memory allocator to system or jemalloc_bi.
Specially for Pilots a common trick to avoid it, tho ocasionally even with this in infantry play i get the fps bug.
i will spread this post and try to collect Data for you by switching the fix off.