Hi Gertrude
Since the issue also occurs when turning off the monitor, this does not appear to be limited to Bluetooth. It sounds more like Windows is triggering a device reconfiguration event (audio/display hardware being disconnected) that Roblox is not handling correctly after the recent update.
Could you check whether the problem also occurs in other games, or only in Roblox? If it is Roblox-only, the issue may need to be reported to Roblox. If multiple applications freeze or crash when devices are disconnected, please check Reliability Monitor (perfmon /rel) and Event Viewer > Windows Logs > Application for crash entries around the time the game stops responding.
If the behavior started immediately after a specific Windows update, you could also test whether uninstalling that update temporarily resolves the issue while waiting for a fix.