I have about 3 days of WU's cached but periodically the internet connection will go down for a few hours or days even (rural life!) Boinc continues to work on the WU's but eventually stops all together. The little blue & yellow icon in the task bar just stays paused. Its a real waste caching WU's if it won't work on them without internet! What am I doing wrong?

Check the Event Log (Ctrl+Shift+E)

It should say the reason of "pause", e.g.:
23/11/2015 11:15:48 Suspending computation - time of day

Boinc continues to work on the WU's but eventually stops

Your own words show that BOINC "continues to work" with no internet connection.
AFAIK BOINC have no logic or Setting to stop Computing when internet connection is lost.
But there are several other Settings that may tell BOINC to stop Computing.

To check for some "hang bug" in BOINC when it tries to use a non-existent internet connection you may try:
- when the internet connection is lost - tell BOINC to not try to connect by:
Activity Menu -> Network activity suspended
BOINC Manager Menu

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- ALF - "Find out what you don't do well ..... then don't do it!" :)
 

Hello,
Many thanks for your reply.

It continues to process WU's and after a few hours of no internet connection it begins to crunch for 5 or so minutes then stops for 20 or 30 seconds then starts crunching (both GPU & CPU) then off briefly, and this will go on for an hour or so then it stops altogether. Last time it happened I rested the mouse cursor over the Boinc Taskbar icon and it said 'Computing suspended due to high CPU usage' but nothing is using the CPU.

I'll check next time I lose internet on the log & under the Activity menu -> Network settings as per your suggestions.

Many thanks for your time.

Last time it happened I rested the mouse cursor over the Boinc Taskbar icon and it said 'Computing suspended due to high CPU usage' but nothing is using the CPU.

Then BOINC may be confused about this "non-BOINC CPU usage"

Check: Computing preferences
Set (use "Edit preferences" at the bottom):
Suspend when non-BOINC CPU usage is above 0%

After you click [Update preferences] button the page should show:
Suspend when non-BOINC CPU usage is above --- %


If you use Local preferences make the change there:
https://boinc.berkeley.edu/w/?title=Local_preferences&oldid=6117#Computing

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- ALF - "Find out what you don't do well ..... then don't do it!" :)
 

Thanks again. Will try your suggestions.