Overheated Laptops
Make sure the laptop is properly shutdown, before putting in laptop bag. The surface you use the laptop on should not obstruct the ventilation holes.
Network Speed
When using cable networking, upgrade to 1gig network cards and 1gig switches, if you are still on the 10/100 devices.
Email Application problems
When the mail applications’ files become too big (normally between 1 and 2 gig on old email application versions), it causes malfunctions. Don’t clutter you email application Delete all unneeded items Clear the deleted items folder Archive the very old folders
Uninterrupted Power Supplies
Test them about every 3 months, by disabling the main power source. If not working, you can try just replacing the batteries (most of the time that is the only problem)
Mail blocking in outbox
If you are not getting an email removed from outbox, remember to put the router off, and then try again.