Describe the issue

The UI frequently hangs for me, either requiring me to wait a very long time for it to become responsive again, or killing bitcoin-qt and restarting it.

Can you reliably reproduce the issue?

If so, please list the steps to reproduce below:

1. Start Bitcoin Core
2. Wait a few minutes
3. Minimize to the taskbar
4. Open the main window by clicking the icon in the taskbar and clicking "Show / Hide"
5. Attempt to do anything with the UI. I have found that opening the debug window and attempting to change tabs will usually cause it to hang.

Expected behaviour

It shouldn't hang, and I shouldn't need to kill it.

Actual behaviour

It hangs, and usually requires force killing in order make the node come back online (it seems to go offline when it hangs). I am unable to do anything with the GUI.

What version of bitcoin-core are you using?

v0.14.99.0-f34cdcb

Machine specs:

• OS: Ubuntu 16.04
• CPU: i7-6800k
• RAM: 32 GB