Groove Agent 5se unreliable

My version of Groove Agent 5se ( 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.
Have tried installing the latest version from Cubase 11 but still the same.
Any help appreciated.