Hi,
Just thought I would share my experience on this issue with my 2016 L&K Superb. The boot would only open a small amount and beep three times and stop. It had to be 'assisted' to open and close. I looked into this on the net and found a lot of issues are with broken wires where the wiring goes from the top of the strut into the body. I ran my cheapo OBD2 diagnostic and there were a couple of error codes for faulty motor and hall sensors but I didn't know which side was flagging the fault.
I removed the trim on one side, unplugged the wiring and removed the strut. Low and behold one of the wires was about to break but wasn't actually broken, only the outer insulation. Taking out the other side there was a thin blue wire broken. I removed the strut from the car and there was only about 5mm of broken wire protruding from the strut itself. I think dismantling the strut is a major operation I didn't want to do. With some careful soldering I added in some thin flexible silicon coated wire and covered with heat shrink. I also repaired the other side as it looked like it was about the break. Reassembled it all and it works fine again,
I wonder how many struts have been replaced because of a broken wire in the loom. The wire is not very flexible and it broke on a very cold day. All in, about 30 mins work and almost zero cost.
HTH