QB Issue Resolution:

Could be a few reasons:

Clear the cookies/cache, they cause these issues

Are you using the qb app?  It is not great.

Try a private window in the browser, that will let you know if it is a cookie issue

Resolution for Issue 'Can you explain why since the Dec 2016 update, the screen keeps turning grey and becoming unresponsive, forcing me to shut down the program and then log back in?' available: Yes (Solved).
Source: Intuit Community forum.

Can you explain why since the Dec 2016 update, the screen keeps turning grey and becoming unresponsive, forcing me to shut down the program and then log back in?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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