What happened to rates between 19 & 20 June?

I had booked Thrifty for our trip in September. Booked Ford Focus for 8 days at $256.94 over 1 month ago. I checked Alamo on Jun 19th and was able to book at Fullsize car for $200.96 for the same period. Cancelled Thrifty rental.

Today, on Jun 20th I checked Alamo and the same car with same discount codes was $289. I also checked by old reservaton on Thrifty to see their current rates. Checking the same dates for the Ford Focus was now $386!

I guess it pays to continually check. Maybe Sunday is the best day to recheck rates?
Check every day.
I often check more than once a day.
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