Well, if you are re-cleaning them and they come up fine then whatever it was has gone away again. Guess you are never going to find out. My guess would be extra filth on the glass from the bad weather, you not noticing it and cleaning normally like we do on a maintenance clean with minimum water when in fact they might need an extra rinse more like a first clean maybe.
Can't be your system if they are coming up ok now.
There were some tremendous winds up north the other week I seem to remember.