I'd personally be more worried about my "boys."
It is more likely result of the inverter electronics utilizing cheap parts than magnetron failure. Bad solder joints, cheap electrolytic capacitors, etc. . Much like the multitude of issues that newer fluorescent ballasts have when compared to the older, "obsolete/banned" magnetic ballasts. I only use magnetic ballasts whenever possible.
Much like the newer "lo-flo" toilets, "hi-efficiency" washing machines, etc. . Everything is being modified in the name of being "green" at the expense of quality and reliability. Thus, in my opinion, doing the exact opposite of what they claim to do, by filling up landfills faster. But I digress.