(BUG) Unexpected 'Error' msgs in Log every 15 mins

Verify the following before opening an trouble issue

Go over all the following points, and put an x in all the boxes that apply. If you're unsure about any of these, don't hesitate to ask. We're here to help!

[?] That OAuth is Enabled for the SmartApp under the IDE.
[X] The App/SmartApp and Device Handler/Driver are using the latest code available.
[X!] You have reviewed the Echo Speaks Documentation for potential fixes.
[?] That Both the Apps/SmartApps and Device Handlers/Drivers have been Published for You in the IDE.

About Your Setup

Hub Platform (Hubitat): C7 2.3.3.140
How many devices are detected?: 6
iOS or Android?: N/A
Mobile App Version (Not required): N/A
App/SmartApp Version: v4.2.0.7
Device Handler/Driver Version: v4.2.0.7
Heroku Server Version: v2.7.2

Expected Behavior

Show no 'Error' entries in Hubitat Logs section

Current Behavior

Every 15 minutes, same two Error messages are recorded in Log. Screenshot: https://drive.google.com/file/d/1u9YDswMEeQEl-FximCxaESGpmeIVMPrV/view?usp=sharing

Steps to Reproduce (for bugs)

Not associated with any particular action(s), just wait 15 minutes. Hub and app are both idle at the times observed.

Context

App reports everything is "OK" and configured correctly, and no practical issues arise from this, but felt compelled to report, since still in Beta. Happy to test out recommended "cures".

Also sent you $10 because you rock! - @LibraSun / Tim G.

tonesto7 / echo-speaks