It’s odd while I almost have no issues with Chromecast. F.i. I continuously cast my dashboard during at home/awake time. Only I don’t cast music to any my 5 devices.
Did you split your 2.4 and 5GHz and give them separate SSID’s? Sometiimes it’s just your wifi configuration.
NetScan, let it check the connection automatically and restart the app when the connection is down (for x seconds).
Flow Checker. If Chromecast crashes or gets paused, the flows involving these devices break. FlowChecker returns a report about which flows are broken, included with links to the flows in the web app flow editor.
Now you know if and which app stopped. With Flow Checker you can also create flows to restart the app again.
(If Papertrails should stop for some reason, almost all my flows will break 
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