Sounds like the same issues I am experiencing.My new Evo3 did not read temp or depth. After several phone attempts with Simrad, I took back to dealer who installed on new boat. They got both depth and temp displaying in instrument bar for both chart and sonar. First time out since, displaying depth goes in and out without any rhyme or reason. It will read for a while and then quit for a while. Only installed Simrad on new boat to use the FMT card, which I absolutely love! Boat on way back to Dealer to either fix or remove off boat.