04-02-2018 03:50 AM
04-02-2018 09:11 AM
Many have reported similar problems with the 70D; often they're traced to a bad component on the main circuit board. Unfortunately, it's an expensive repair. Fortunately (if you're not one of those directly affected), the problem seems to be unique to the 70D.
The condition is described (and bitterly complained about) in several threads in this forum.