iOS Simulator Hangs Intermittently on App Launch

I am having a problem where Appium is hanging when launching into the iOS simulator. It happens about 50% of the time, and then the other 50% of the time everything works fine. However, when it happens, I have to shut everything down and even sometimes have to restart my computer for it to start working again.

I am running the latest 1.3.1 Appium Desktop client.

The Appium Server logs say:

[XCUITest] Sending createSession command to WDA
[JSONWP Proxy] Proxying [POST /session] to [POST http://localhost:8100/session] with body: {“desiredCapabilities”:{“bundleId”:"<bundle_id>",“arguments”:[],“environment”:{},“shouldWaitForQuiescence”:true,“shouldUseTestManagerForVisibilityDetection”:false,“maxTypingFrequency”:60,“shouldUseSingletonTestManager”:true}}

Any ideas of things I can try? I am out of ideas. Thanks in advance!

Same happens to me also. Have you got any solution?