2007 volvo with cummins cm870

[ktblogistics]

have a 2007 volvo and the issue is that RPM gauge and speedometer gauge go down
while driving, accelerator pedal stops working , need to park on side of the road and restart the truck
sometimes the truck dont want to start back , just cranking
made a copy of codes when truck arrived (see attachments)
checked J1939 for resistance at ODB port - 60ohm with key off
run nexiq tester for canbus statistics and started to wiggle cables but couldn't make any errors on canbus, checked power supply cables with batteries for loose wires
cleared codes
test drived it , happend once speedo went down for 2 sec on bump
only code that came back was EC-60 Advanced ABS J1939 Communication

any clues what i can check?
assume its bad connection somewhere