Sense Hat with Pi Zero power problem, how to diagnose?

[arbitrager44]

Hello. I am working with the sense hat on a Raspberry Pi Zero. I'm very new to Pi and could use some help. Most of the time when I boot the Pi, the sense hat is not detected by Python and the LEDs stay on the rainbow pattern. I got it to work properly for about an hour but then it went back to being undetected. Further, it is clearly very sensitive to how it is seated, meaning, if I jostle it slightly the LEDs may power off or become dim.

Hence I am sure this is a power and/or connection issue but I am unsure how to diagnose what precisely is the problem and/or what kinds of things to try. I've read on the GitHub threads several similar issues where it seemed a proper connection was the problem, but the solutions tried by those users involved different Pi devices, a problem that I don't have (like other items plugged into the Pi), or older solutions that clearly don't apply. Please help!