Upload & Sell: Off
I have Canon, Nikon, Leica, Hasselblad , Sinar
Dump the ones like Canon that cause you grief. Then, you won't be so full of angst.
PS: I hear the Nikon D800 left side focusing problem is giving many owners lots of pain. Wonder if you were affected. If so, you should dump Canon and Nikon. Hopefully, Leica, Hasselblad and Sinar produce perfect out-of-factory products that suit your needs. Then, you'll be one happy camper. Why suffer?