The 7x and 8x lathes have electronic speed controls that have a reputation for being fussy.
There are groups specific to these lathes that may help with some of the trouble shooting. I know we have people that own these lathes, but there doesn't seem to be much active discussion of them.
It may be worth making a post specific to the issue you are having which may get the attention from some of the mini-lathe owners.
There is a groups io group for the mini lathes that is pretty active. I believe there are also some mini lathe groups on Facebook.
https://groups.io/g/7x12MiniLathe
It is not uncommon that new owners have to do a fair bit of work to get these small lathes working well, but many are quite pleased with them once they have worked out the bugs.