Lumia 520 failure to connect to Store and update apps

For the last couple of weeks my Lumia 520 will not connect to Store and will not update apps.  I get the following error messages:

• When trying to go to Store or update the 16 updates that are available:  "There has been a problem completing your request. Try again later.   Error 805a8011"

• When trying to download updates:  "801882CB: update couldn’t be downloaded".    Web explanation of this error code is "This is a network connectivity error. Make sure that your device has a good connection to the Internet, through Wi-Fi or Cellular".   I have no problem connecting to wifi (tried in a couple of places) and all apps that require wifi connection work just fine.

• When I try to get my cell phone to check for updates I get: ****"Error #80072ee7  -  We are currently unable to check for updates"
• I suspect that the this problem also prevents me from getting the Amber update, which is now available in Canada.

Questions:

• Why can't I connect to Store and update the apps?  (My date of birth on Microsoft is right)
• What do I do to resolve this problem?

Any help or advise will be greatly appreciated.

Thanks

Noam