Maybe it is not your cookware or your glass cooktop. We have several fans circulating the air because of the wintery weather and having to keep the doors and windows closed. This causes some cold drafts and definitely can create a problem with cooking. I have a gas stove so it easy to detect a draft when I use the stove top burners. A little more difficult with the oven.
When I use the oven and don't want it to over heat to compensate for the chilly air, I can turn on a burner. If you have an electric stove, you can lite a candle and sit it on the counter near the stove. During the summer when we have the windows and doors open and it is hot, the oven compensates for the heat and cooks lower. It can be very frustrating.
I do agree with Katie E that cookware works best when handwashed. The heat in the dishwasher will cause the holes where the screws keep the handle on to expand and lead to loose handles that cannot be tightened. It also happens if you use a large burner with a small pot. Just a few ideas to help you solve the mystery.