Troubleshooting App Deployment

Dear all, we have assigned a few Windows Store & Win32 apps. These apps are assigned to users & devices basic. few of the Win32 apps and windows store apps installed successfully, however, few win 32 and Windows Store apps say “Waiting for install status” on the “Managed Apps” tab of the device. On each failed app “Device/User install status” it says “Install Pending”. company portal got installed successfully. We had noticed a few strange things, app status its showing waiting for install status. but we click on the app then in stating the app is failed but after 4-5 min app gets installed. We had restarted the device multiple times but all those apps still show the same issue. Not sure how to troubleshoot this, any help would be much appreciated, thank you.