Bullet Time Issues

I noticed that bullet time(BT) acts strangely when I switch vehicles while it is engaged.

The main problem is that after the switch, BT no longer consistently works for any car other than the initial car in which I turned BT on. Sometimes re-spawning one or both vehicles will allow a one time use of BT in the second car, sometimes it wont work at all, and some times BT will work normally, until I switch cars again. Also, again only sometimes, when I re-spawn the initial vehicle in (in normal time), it will re-spawn in BT. The one consistent thing I have found, is that no matter what, BT always seems to work fine for the initial car(except for the whole re-spawning in BT thing).

Is anyone else having any issues like these?

Thanks