A system hang or freeze requiring a computer restart usually means a low level failure such as a driver (bad video card driver, etc), failing hardware (hard disk, video card, etc.) or damaged OS installation. In this case, I'd suspect the driver for the graphics card is wonky. What version of macOS are you on? What graphics card is in it?
One way to confirm this is to open Bridge's Preferences, select the Advanced tab, and check "Use Software Rendering" to avoid accessing the driver.