should I restore the factory settings on Lumia 640? The internal memory is getting too full.

[Windows Central Question]

Erasing the temporary files is not effective

 

[P1ng0fDeath]

That's a radical solution for this. I'd try deleting apps and files you don't need first. If that doesn't help, consider buying a SD card.

 

[Chintan Gohel]

Erasing the temporary files is not effective

check in storage sense to see what is taking all the space. Is it mail app or other apps or system?

You can uninstall apps, remove photos, downloaded maps to create space. Factory reset is the last option to try

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