If that pH was early AM, then no biggie unless it gets to 9 in the PM. Fuge lights can run at night to compensate for that.
The temperature has changed recently and that means you probably aren't running your a/c now. Also the evaporation rates have changed. If your tank temp swings because the house heat kicked on, that will also cause bleaching. Stained water from lack of changes or a skimmer running soft or some other sudden change will contribute. Old light bulbs will also cause health to decline and new bulbs are a sudden spectrum and intesity change that can cause bleaching. Check temp at different times of the day as well as pH. Check the temp and pH just before the halides go off and see what the highest and lowest points are every day. If your water changes and maint are regular, then that would not be it, but, if you neglected water changes for a while and then suddenly do a couple back to back, that can be a problem.