Hi Max1234567,
Thanks for get in touch with us. So you having problem since you sent controller to Vestax for service? Try install ITCH 2.2.2 with controller again and see how it go. Use different USB cables and test it out is good idea too. And also try and rebuild your DatabaseV2, follow instructions from here (
serato.com) and reopen Serato DJ and see if that helps.
You might have Database V2 files on your different partitions of your HDD & External drives so you will need to rebuilt all of them.
But your issue could be hardware problem because you have tried to connect other computers and had same problem. Please let me know how it go and also I would suggest you to contact with people did service for you controller.
Kind Regards
Rui