My first Panasonic body was the GH1, it was paired with the 14-140 ois, it was my first mirrorless body some 9 years ago. I added various lenses over the years, the 20mm, 14mm, 12-35/35-100 2.8 etc etc and also upgraded through the various new releases, from GH2 to GX7/GX9 with interludes with the OMD bodies. I don't know how many lens and bodies I have gone through, a lot, and never ever once have I sent anything in for repair, never, equally, I have never had a single failure, never. I am either very lucky or very careful or maybe its just that most Camera gear today is extremely reliable.
My Panasonic bodies: G1, GH2, GX7, LX100, G85
My Panasonic lenses: 14-45, 45-200, 12-35/2.8, 35-100/2.8, 15/1.7, 25/1.4
Only mechanical failure was that a spring under the GH2's shutter release button failed. It didn't stop the camera from working but it was an annoyance. Sold the camera instead of repairing it.
Did I continue to buy Panasonic products after that? Of course.
Am I OK with Panasonic's out-of-warranty repair policy on the 100-400. NOPE.
Will I buy the 100-400? I'm not sure. I WAS set on buying it but its high repair cost, plus the numbers of problems I've heard about it (including from one of Panasonic's own ambassadors) has made me consider other options as well. They're shooting themselves in the foot over this.
Either way, I can only say this is starting to feel like a hate campaign and while I am sure many have their reasons I cannot believe in the main there are this many if any issues with Panasonic gear.
You're missing the point. It's not the number of failures, it's the cost of repair that many of us are not happy about.