Ipad restart loop after replacing parts.

I have an Ipad Air and i have fitted a new battery and digitiser for it. I decided to do a test of the ipad to see if the new battery and digitiser worked and while the ipad does turn on, it turns off shortly if I drop it from a small height of around a cm or so. It does not do this if i apply pressure to where the LED connector and digitiser connector shield is, is this a result of improperly fitting something or do I simply need to apply the digitiser adhesive and seal the iPad once and for all since that might apply enough pressure across the entire LED? It also gets stuck in a restart loop from time to time.

I also understand that the Ipad can turn itself off if something comes out of its place leading me to believe that the battery might somehow also be improperly fitted?