Wifi Issues

I have a 5 Sapphire and have it set up to wifi. I had it working fine last night then today when I tried to sync I today I got a "Network error please try again later" message.

Deleted the watch from Garmin Express. Added it back. Watch synced via wifi.

Left the house for 2 hours, came back, attempted to sync via wifi and got the same message.

Any ideas why it will work, but then stop working just a few hours later?