Mac OS Catalina and SideCar - "A miscellaneous error occurred (32002)"

I just upgraded to Mac OS Catalina on 13" MBP 2016. I'm trying to use SideCar on an iPad Pro (with iPad OS), but everytime I select it as the SideCar display in the Control Centre, it works for about 3 seconds and then I get an error "Unable to connect to iPad, A miscellaneous error occurred (32002)".

How's is other ppl's experiences using SideCar? It's seems completely unworkable for at the moment.

On another sidenote, everytime I boot up my MBP with my external monitor connected (LG 34" 5K display), the mouse pointer and where it actually clicks are in different positions on the screen i.e. there's a misalignment of the cursor pointer and where it actually is. I need to disconnect my eGPU, unplug the display and then reconnect to get it aligned properly again. Quite annoying.

I also had to reboot about 5 times before I could iCloud to sign back in again also (iMessage wan't working initially).

I really think Catalina should still be in beta. Definitely doesn't seem stable yet. I hope patches are released soon.