If it's consistent, then the trends still apply and have fabulous value.
Personally, I've had some real doozies where sensors have just read all over the shop; one minute very high, then flat lining in the low 2s. I'm not going back to check, but probably 50% of my sensors have been replaced by Abbott, due to their "curious" activity.
I still love it, but I wouldn't get carried away with it.
My personal experience, with my weird and wonderful (in it's workings) body