Sync reading list across devices?

[nexus7man]

I have a PC, Lap top and a Lumia 640 phone, all run windows 10. All current and updated.

Syncing my reading list is patchy, sometimes it works across all devices, sometimes it only works across two devices instead of three and sometimes it doesn't work at all.

All devices are set up to sync, all use the same MS account and all are in the same WIFI network through a BT home hub.

All devices except my phone are set to stay awake and wont go to sleep if left unattended.

So, how does syncing work? Does the device send the information to Microsoft as soon as something new is added to the reading list? And then Microsoft sends it to all devices signed onto the same account? How does it actually work?

 

[nexus7man]

Ok so I set a few reminders with Cortana and they synced pretty much immediately, whats stopping Edge? any ideas?

 

[Rosebank]

Having this issue with 950, added a page from this site actually to read in bed later on the phone, so I added it to reading list on the laptop, yet nothing on the phone, ...? all settings correct, bookmarks and saved pages work ok but the reading list does not sync.