Notes sticking on virtual keyboard

Just got an iPad Pro 9.7 and installed cubasis (having previously used it last year in an Air 2).
Am getting stuck notes on the virtual keyboard - the note that sticks is visually stuck and is recorded as being held down. This appears to be happening randomly.
Does anyone have any suggestions - I’ve not experienced this before?
Many thanks

Hi Grouch,

Please provide more infos what instruments you have in use when experience sticky notes.