Content Airtime Settings reset automatically after a while.

Steps:
1. Create a new Landing Page.
2. Add a Schedule block.
3. Add a content item.
4. Open the airtime settings.
5. Modify the hour and click submit.
6. Open the airtime settings and leave the form open for a while.
Actual: Settings reset. Date changes to 01/01/1970, Time changes to 1:0.
Expected: Settings are not changed automatically.

Remarks: Please see attached.

Important: This issue with refreshing preview affects all pop-up forms in StudioUI Edit mode / wizard.