I am not adverse to the space-time continuum theory as I've been ... well, kinda new-agey since Mother 'graduated'.
.
as to being children; attitude is everything in life. If I acted my age I might be accused of being one of the ghosts messing with your clocks.
but, since I don't believe in ghosts, we're down to my theory and some dirty power.
and this has been happening for 15 years? My you have patience.
so, let's get serious.
are you supplied by a public utility company?
have you placed the fast clocks in other rooms and if so, how did they react?
Do you notice any problems or oddities with anything involving electricity?
just to be sure, by digital clocks, you mean the type with LED or LCD display and not the original digital clock that simply had a roll of numbers that spun around like a rolodex (See, I told you I was old. I'm hoping you know what the heck a Rolodex actually is) and there were all of similar type?
have you plugged the clocks into different receptacles in the room? and?