Timeout error for GetCurrentUser activity

Hi,

I have an application for which I'm getting an intermittant workflow error as follows: "There was a workflow error running activity: Timeout exceeded". Wondering if anyone is familiar with this problem. It is very infrequent and generally occurs when I'm running the app on wifi and presumably a slower connection than on our office network (its a mobile data collection application). I see no corresponding error message in the system log files.

The workflow is fairly simple. It uses CurrentUserInfo to get the users name and then provides a data entry form and allows users to submit data to a sql DB via a non-sql query activity (either update or insert depending on the WF input parameters). The user name is one of the values submitted. It looks like the timeout problem may be with the GetCurrentUser activity, but no idea why it almost always runs instantly, but occasionally takes so long as to timeout (seems over 60 seconds or so).

Version 4.2 of essentials and 2.3.3 of html5viewer

Thanks