Groove Agent 5se unreliable

Hi
My version of Groove Agent 5se (5.0.20.207) tends to crash and hang regularly. Mainly when loading kits and playing back patterns.
Using Cubase Elements 10.5.
It’s frustrating because I’m having to buy other drum plugins as a result.
Everything else including Halion Sonic 3 & SE, EZdrummer 2, Addictive Drums 2 trial all run fine.
Steinberg suggested clearing Cubase preferences but hasn’t fixed it.
UPDATE:
Have tried installing the latest version from Cubase 11 but still the same.
Any help appreciated.