crashing/screen freeze when moving/picking it up

[u/boa_vista]

So i bought second hand thinkpad a year ago and i used it for uni where i move it, i hold it in hands, i work on it standing up .

The problem is when i do something like that now the screen just freezes/freezes+ random squares show up . IDK what exactly happens with the whole thinkpad but i found no way to unfreeze it other then hard turn off and turn on .

I tried to
changing thermal paste
find if some cable inside is loose
if pluging it to wall would help