Bad caps are a common issue in cheap products of all sorts. Computers had lots of power supplies dying off a few years ago and CFLs have had the same issue. A couple of years ago I bought four CFLs. All died in under a week. I took one apart and found a failed capacitor. I assume all four were from the same production run and all had the same low quality but very cheap caps. All were Lowe's house brand and were far less expensive than the Philips or other CFLs and I'm sure that the components were the very cheapest that the manufacturer could find and probably with specs that were lower than any quality manufacturer would allow. I didn't check, so it is also possible that they were installed backwards, but they tool a little too long to die for this to be likely
My house is 18 years old and almost all of the original incandescent lights are still working fine.Not a single one of the 14 flood lights in the house has ever failed even though those in the kitchen are used quite a bit. I have replaced almost half of my ten CFLs, some more than once. None is over 3 years old
My biggest issue was that the ones I used were top-rated in Consumer Reports. They did not do any life testing nor did they tear down any units to look at the components. I just hope the much more expensive LEDs I have now installed have fewer issues. I'm sticking to name brands with these as well as CFLs. None of these has failed as of today.