kopfi
3
Hey Rodrigo,
I do not have those issues with the display or the bottom module (yet), but you see a fair amount of posts similar to yours in this forum.
So if the modules do not make good electrical contact, I would assume its either a problem of the spring-contacts or probably broken solder joints.
If its the latter, you may be lucky: Some time ago, I saw a post that proposed a makeshift reflow repair method. Heres the link:
If you are willing to experiment, that may solve your problem 
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