Installing macOS Big Sur beta

Hi,
I've got Big Sur beta installed but have come across a major issue, as in when I attach either an EX. HD or even an USB as soon as I double click on the icon to open the laptop crashes, I have even tried both USB ports and several cables and EX.HD's, I get the same problem which doesn't really help as I now can't attach my eX.HD with my Time Machine Back-up.

So the question is, I saved the Installer for Big Sur, I'm thinking of re-installing it, just to see if this fixes the problem , any comments here as to whether or not this is a good idea ?

Advice please.

Steve ( UK )