For the past few weeks, our water pressure (entire house, hot and cold) has dropped in the morning fir about 30 min... I don't have a water softener.I called the city to see if they were doing work (no they arent) and the lady I spoke to suggested my pressure regulator may be going out? This has happened a few times in the past, but seems to be more consistent now...
Any ideas?

If you have a pressure reducing valve near the meter this could be malfunctioning