Aside from checking your anti virus program, you can even use a taskmanager to check if there are other processes impacting on the application. In the Task Manager, you can right-click the Glass windows icon. When you have opened it, you can see all the processes affecting the Discord program.
The best part is the fact you can do this by running the iphone app in a non-administrator mode. The standard way to do this is certainly to uncheck the Manage as administrator checkbox. Also you can do this by clicking the Compatibility tab. Then, you are able to click the OK button to apply the alterations.