Travis connected test fails occasionally

[dmfs]

:opentasks-provider:connectedDebugAndroidTest

Starting 0 tests on test(AVD) - 7.0

Tests on test(AVD) - 7.0 failed: Instrumentation run failed due to 'Process crashed.'

com.android.builder.testing.ConnectedDevice > No tests found.[test(AVD) - 7.0] FAILED 

No tests found. This usually means that your test classes are not in the form that your test runner expects (e.g. don't inherit from TestCase or lack @Test annotations).

:opentasks-provider:connectedDebugAndroidTest FAILED

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':opentasks-provider:connectedDebugAndroidTest'.

> There were failing tests. See the report at: file:///home/travis/build/dmfs/opentasks/opentasks-provider/build/reports/androidTests/connected/index.html

Restarting the build usually succeeds.

[lemonboston]

Another failure message:

Skipping device 'test(AVD)' for 'opentasks:': Unknown API Level

 > : No compatible devices connected.[TestRunner] �[31mFAILED �[0m
Found 1 connected device(s), 0 of which were compatible.
:opentasks:connectedDebugAndroidTest FAILED

FAILURE: Build failed with an exception.

Same is true, that restarting the build may solve this.