The latest incidents happened on the 91 Freeway in Corona. The driver of a Range Rover heard his rear window shatter.
A similar incident was reported on the 91 at Kramer Boulevard in Anaheim, with a driver's window being blown out.
Investigators say the windows may have been shot out with BBs or pellets.
There have been multiple similar incidents reported in recent weeks on the 91 and other freeways.
Windows shot out of multiple cars on Orange County freeways in past week, CHP says