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Not a coincidence.
Your CRTs are from philips' 45AX series, this was the first Philips CRT with square corners in 1986, they had an all-new gun design and they were a real abortion, 9 out of 10 will have some kind of gun failure ranging from really poor focus to shorts or dead cathodes you can't rejuv. good luck finding a decent one for your sets...
Instead, older Philips tubes, especially 20AX, 30AX and the delta guns were excellent, durable CRTs, i have yet to come across a bad one.
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