An error occurred while saving the commenthirogen commented
From technet forums try this maybe? This issue seems caused by web client adding lock on the file.
You could try to add below registry to disable the lock function of web client service:
<additional information and recommendations>
Registry to disable lock function when web client service is started:
1. Start web client service on user side
2. Find registry: HKLM\SYSTEM\CurrentControlSet\Services\WebClient\Parameters on their machines.
3. Find value: SupportLocking(if no, please add), set its value to 0, want to just disable lock feature.