External monitor keeps disconnecting once in a while

Hello NalimP99,

Thanks for visiting Apple Support Communities. We understand that you're having a recent issue with an external display connected to your Mac. You've completed some great steps so far too. In your troubleshooting, did you also check all ports (Mac and hub) for signs of dirt or debris? This can cause connection issues. if any is found, gently clean it out: How to clean your Apple products

The steps in the following guide may also help to resolve this issue: Get help with video issues on external displays connected to your Mac

If not, reset the NVRAM as that can help with display type issues. Please note, if you use Find My Mac it may be turned off after resetting the NVRAM. Be sure to check, and turn it back on, if needed: Reset NVRAM or PRAM on your Mac

If the issue continues at this point, start your Mac to safe mode to see if it happens there too. This will let us know if a third-party app or process is causing this to happen: How to use safe mode on your Mac

Keep us posted.

Take care.

NalimP99,

Thanks for going through those steps. When you did, were you able to connect the monitors and check for updates as mentions in the "Before you begin" section? Do you have any third-party display software installed? If so, does temporarily removing those help? Also, does the monitor work in a test user account? This will tell if it's a system-wide issue or only with your account: Set up users, guests, and groups on Mac

Let us know.

Cheers.