Problem with F25 after upgrade - F24=>F25; KDE desktop keeps freezing forcing several reboots before suceessful restart.

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After upgrading F24=>F25 using;

sudo dnf upgrade --refresh

sudo dnf install dnf-plugin-system-upgrade

sudo dnf system-upgrade download --releasever=25

sudo dnf system-upgrade reboot

from; https://fedoramagazine.org/upgrading-...

I'm having a problem with F25 after the upgrade; KDE desktop keeps freezing forcing several reboots before sucessful restart.

The several reboots are because the computer freezes.

I'm using a DELL LATTITUDE E6410

I'm new to Linux and have no coding knowledge.