Hi @Henk_Renting,
i had sort of the same issue on after a few days of good working zigbee (after the update to v5.0-rc50). Athom support suggested me the procedure below which fixed it for me (all devices and flows stayed in tact):
(google translated it, was too lazy to do it myself)
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Submit an support ticket at Athom with a diagnostics report so that they can fix this problem
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Put your Homey in recovery mode by turning it upside down for 1 minute.
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If Homey is in setup mode, you must then go to https://setup.athom.com with a laptop or desktop.
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Select the desired language, and go to the next step.
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Choose “Continue in the browser” (it says in gray), and follow the steps on your screen.
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When you see “checking for updates”, press the ALT key on your keyboard. Press “Download full update”.
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Then choose to keep your data. Homey now needs some time to install the update.
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test if it works and if so make an second diagnostics report and send the ID to Athom via an email reply on the created support ticket in step 1