>>>Found also this very discouraging thread https://social.technet.microsoft.com/Forums/exchange/en-US/ef5af8fe-c18f-4154-8af0-95e48c0f66d8/outlook-2013-disconnects-to-exchange-server?forum=exchangesvrclients
>>>
>>>Don't know what to do at this point. I don't want to keep re-booting my laptop every time for that problem.
>>
>>Are you sure it's the laptop that is the problem and not the exchange server? There is a hotfix for outlook 2013 https://support.microsoft.com/en-us/kb/2876644
>> If it's the exchange server then try this https://support.microsoft.com/en-us/kb/2962915
>
>Outlook hotfix is not applicable to Windows 10 (it's for Windows 7). We do use Exchange Server. I got that exact problem now again.
>
>I'm going to upgrade to office 2016 on Monday, hopefully it will end my misery.

By "losing connection", do you mean that you are asked for username and password?