Alexa sometimes responds with "I could not find the Device XYZ or Group in User's profile."

[KenADev]

SUMMARY

Everything works fine (often for days) but then Alexa suddenly (without changing anything or re-deploying) responds with "I could not find the Device XYZ or Group in User's profile." (translated from german) for most of the devices. When trying to switch them via the Alexa App, a "Device not found" error is shown.
However, some devices still work. Disconnecting and re-connecting the Amazon Echo from power solves the problem.

Not sure if this issue is related to the node-red-contrib-amazon-echo or my Amazon Echo.

ECHO DEVICES

• Echo 2nd generation

MODULE VERSION

0.1.10 (via Palette)

CONFIGURATION

does not apply

CONSOLE OUTPUT

does not apply

STEPS TO REPRODUCE

Problem appears arbitratily

EXPECTED RESULTS

does not apply

ACTUAL RESULTS

See above.