Val, I have been having the same problem!! On friday night it started for me. Granted I was up a lot later helping move stuff, but not much more exercise then usual (ie a 5 mile run during the day). 15-30g of carb wouldn't have been shocking but I had to take over 300g of carbs in a 6 hr period and still woke up at 70! I think thats the most I have ever had to take supplementally for my basil. I figured it was a fluke with the move so I continued to do 35 units and again I went super low. I've been on 30 U's the past two days. It worked fine the first day, but right now my ratio is all messed up and I am at 350 right now

. Sorry I don't have any good advise, but I feel your frustration.
-Brian