GTC time is internally used by vision apps/TIOVX for timestamping different objects. GTC is a 64bit timer, but R5F is a 32bit processor. So reading GTC timer from R5F can create issues, especially when GTC is about to overflow. The only solution is to read GTC two times, before and after it is found to be overflowed.  This fix specifically needs to be done from the R5F side.