tonylong wrote in post #18009518
Well, you've certainly had a stroke(s) of bad "luck", no doubt!
We've all heard stories of different camera bodies having troubles. Some problems are from a fault in the manufacturing process, others are a fault in the equipment itself. Some faults cause a large number of problems in a broad "base" of bodies, some will just arise from one element that goes faulty in one body.
But realize that there is a major "process" in manufacturing, then testing and releasing this type of equipment. Modern camera bodies combine digital/computer operations with analog electronic operations, and that is no easy feat, and it especially becomes a challenge when something goes haywire!
Companies such as Canon have a rigorous process of building and testing components and then assembling and testing those components for the final release. Often, problems are detected during that process and are fixed at the lower level of operations.
However, some failures will just get by, and end up in the hands of unhappy users, who have to identify that problem, then report it and send the product back to a Service Department. This is a headache to the poor end user, and of course the headache becomes intensified when more than one product is involved!
On the manufacturing end, the goal is that a very small percentage of shipped units will be defective -- let's say .5%, as in 1 camera out of 200 will tend to have a defect that was not spotted in the assembly/test process. However, when a new unit/version has been developed and released, that estimate goes up to, say, 5% defects in the released units. While these problems are being tested/troubleshooted after the defective units are returned, it's still a real headache -- 5% would be 5 units out of 100 that are defective, returned, and must be not just fixed but analyzed, the defect diagnosed, and then a solution found that would then apply to the thousands of units that have been returned, and the resulting fix put out to the affected manufacturing process.
I've been in the middle of such an operation, and I know: the "team" works hard to put out quality products, and they work hard to solve problems, otherwise why stay in business? But still, when a new body comes out, and people jump on it to get the latest "new thing", well, you run the risk of finding the latest defect! This type of thing has happened repeatedly with cameras, with printers, with lenses, and the list goes on!
Give it time, and as you read the "news" about the Canon 7D Mk II, you will begin to see more good news, and less bad news about defective bodies. It's not just the 7D2, either. A bunch of years ago, maybe 9 years ago, the top-of-the-line Canon 1D Mk III came out as the "heavyweight" in shooting sports, wildlife, birds in flight, other similar demanding photographic fields. And people flocked to it, hey, it pioneered technology that the 7D2 bodies have actually put into a smaller body, but the 1D3 put it into place and we were all excited!
However, as those early days went by, stories kept popping up about problems with the 1D3 when autofocusing in the AI Servo mode, it was very frustrating, especially because the users put in a lot of time and effort to lug the heavy body/lens equipment around to test and try to figure out whether it was a camera problem or a user problem...?
Well, in time, Canon finally found the answer! There was some kind of faulty element in the body, I don't remember the specifics, but they put the fix in place for the newly manufactured bodies and also called for the return of all bodies that were made/released before the "fix" date, and yoo-hoo, they succeeded! I was able to get one of the new bodies via Amazon (before places like B&H/Adorama had them in stock), and I took that puppy out and ran it through pretty thorough tests, and was satisfied!
So, yes you have encountered it looks like problems with two bodies. What you do about it is of course your choice -- move on with other "proven" equipment, or watch and wait until Canon has identified and resolved the problems!
And just know that you are not alone in such things!
And, think twice before jumping for the latest and greatest new thing!