Affinity Photo not responding

[Rubyjim 6]

When I close Affinity Photo or designer I get Affinity photo, or designer has stopped responding message. for about 30 seconds then closes ok.
Should I increase Ram usage limit? 
The Ram Usage is set at 4096 default. 

[Lee D 445]

Have you noticed if this is happening after you have selected to Save a document and also close the app. The app may need to finish saving first before it can close, the ram usage usually is set to the amount of physical memory installed in the system.