U1000 means lost comms with ECU, which in plain english means.
the ecu is losing can bus connection momentarily - find a mechanic who is qualified in networks and electronics and owns an oscilloscope to see the can traffic and repair.
Also make sure to never connect or disconnect the scan tool to your vehicle with engine running or key is on.
I repaired a similar problem recently on a mercedes E350 2008 - it was not a can issue though, the ecu was actually offline, the car was dead and not starting because of a corroded wire connection (thanks to detailer and washing hazraat here)