Tuesday I rode to the lake and back. Put about 26 miles on the bike and it rode great the whole time. I sat in this parking lot and let it idle for about 5 minutes and it did so perfectly maintaining 1200 RPM.
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Today I started it, let it warm up while I put my gear on, then rode a couple miles to the auto parts store to buy some detailing products. At a stoplight, I noticed my idle had dropped to maybe 800RPM and I had to blip the throttle to keep the bike from stalling. The issue persisted on my ride home, even after parking in the shade while in the store.
I'm not sure what the issue is. The weather is almost identical to Tuesday. I can only suspect that perhaps a carb has gotten gummed up. I added a fuel system cleaner to the tank when I filled it up last week. So maybe it has worked some hard stuck gunk loose and created a clog.