Hello there! It's unfortunate to hear that you've experienced some difficulties using RaspiBlitz. Such experiences can be frustrating, I understand. Lightning Network is still a very early technology, so hicc-ups are to be expected.

As for the specific issue you have faced; closing channels on the Lightning network does take some time as transactions need confirmations between each stage of channel close-down process... it just has something like procedures and processes every channel opening/reopening or even the cancellations command too.

However with proper planning before connecting your RaspiBlitz autopilot node to other nodes and channels at early times when most users preferred normal/hardware from desktop setting things this kind of situation could possible mitigate.

Let me know if you got any questions or needs any information related with implementing/configuring your node. Happy to contribute further towards making Bitcoin/Lightning user operations as delightful as possible xD