Android: how to flush cached data?

[KroMignon]

Hi all,

I have, sometimes, problems when trying to install APK on Android device.
I've got an error "INSTALL_FAILED_INSUFFICIENT_STORAGE", but a check on my internal storage gives 2.5GB are free!

When I restart the device, APK installation is working well!
So, I think there are some "cached data", which are not flushed and this will block the APK installation.

Is there a way to trigger a "flush" of those data per software?

I didn't find anything relevant with google, perhaps there is an Android expert here who could my give some advice?

Best regards
Fabrice