It’s possible that there is a problem in PicSender, but if so, very unlikely.
What you are experiencing is most likely a USB disconnect which, unfortunately, is very common occurrence.
Things to look for are settings that allow your computer to shutdown devices when they are not active. Not only the devices, but the USB hubs on your system.
Some people find that their USB cable is at fault.
Use the search function to locate threads that speak to disconnect issues.