Coincidence- or not?

I had two wall switches fail within a few days of each other.

A heavily-used 40 year old bathroom light switch caused its 20 year old
plain vanilla wall fixture with six LED bulbs to strobe-flash when
turned on. All bulbs (installed sabot a year ago) flashed. New switch
fixed it.

One of two occasionally-used 33 year old three-way switches controlling
a ceiling fan in another room also failed- it had to be in the ON
position for the fan to turn, Haven't replaced it yet!

Both are Leviton switches and installed by an electrician during
original construction. Not aware of any electrical surges- all
electronic equipment, etc., working fine.