2017 L&K Hatchback tailgate issue

Hi, I've got a weird powered tailgate issue on my Superb.

If I press the interior button I can hear the lock release, but nothing happens after. If I press the button on the outside of the boot, the lock releases but nothing happens.

If I press that button a few more times, I will eventually start rising but only to about half way. If I press the outside button again, it'll drop back down again but I have to press down on the boot to get it to do the final catch.

The button on the inside of the boot lid does nothing apart from occasionally dropping the boot down when it fancies it.

I've tried manually pushing the bootlid to it's maximum opening and then holding the interior bootlid button for 3 secs. I get the funny beep but no change in behaviour.

I took it to the garage, they said it was the pulldown motor. Got that changed, no difference in behaviour.

Anyone had this before? Am I in for a new pair of struts?