Severe lows

In the past 3 weeks I have had several lows in the 30’s. The funny thing is that I don’t even notice them. The normal way to find out about them is when I test and see the very low numbers. In the past I have felt a low around the 60’s.

So I am wondering what is going on to change my diabetes. All I can think of is that I need to test more than I am currently doing (which is 4 times a day).