Q.Squash Going Soft at a Couple of Inches
Almost all my squash and zuchinni get about 2 inches long and then begin to wrinkle and get soft at the blossom end. They do not grow any bigger.

Certified GKH Gardening Expert
It sounds like a pollination problem. These articles will help:
https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-fruit-falling-off-the-plant.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/pollinate-squash-by-hand.htm