I have the same problem. The first two prints were okay, but now I am not able to print even a base for a figure.
Indeed, after leveling, the settings are way off at some time.
This I what I did:
Manual leveling, at all four corners the supplied piece of paper slightly has a resistance.
When I start to print, the first lines wouldn't stick sometimes to the bed.
The bed was cleaned with alcohol. The temperatures are set to the filament (PLA) requirements (200, 40). I also tried a bed temp of 60, but without any good results. (Z order to big?) Sometimes the filament clogs at the nozzle and drags all other lines of the object across the bed. (Z order to small?) So obvious something is wrong with the Z order. After checking the levels, the piece of paper (used before when leveling) is stuck at some locations or doesn't have any resistance anymore.
Auto leveling doesn't help. Same result. Adjusting the Z order from -1.95 to -1.90 makes a big difference. At some time, it is not accurate anymore.
Conclusion: problem with leveling.
For now, I cannot use this printer. I have the printer now for just one day, very disappointing.
Another issue is that you cannot print a object with a width of 218 mm.
The bed is in width 220 mm specified (235 mm measured), but this is not the width of an object you can print.
I manually set the bed width to 230 mm, now you can put you object in the slider software, but when printing, something goes wrong.
For my understanding is when you specify a print area of 220 x 220 mm, this means you can print on that area without any margins to take into account.
I hope someone can help me.
Thanks in advance,