HA linked to Alexa app ( unresponsive devices)

Hello guys,

I have been using my raspberry pin with HA for almost 5 months now and in the meantime have added more devices alongside an Alexa etc.

In the past couple of weeks all of a sudden any zigbee devices are now completely unresponsive on Alexa app and when asking to switch something there is nothing.

I tried to check if any firewalls may be blocking it but I only ever had nabu casa setup for control when I am away from home.

Does anyone have any suggestions I could try to fix my issue?