It you have the wheel spinning, it means the main reactor is busy. This happens if a process doesn't release control quick enough, and could happen due to a program issue, or the fact that is has to wait for an external event.
For example, if you have some process that accesses the disk, or a NAS over the network, and the disk(s) are sleeping, that process has to wait until the disks are spinning again. While waiting the spinner appears and the box is unresponsive. An other likely candidate is the autotimer, if it has to check existing recording for duplicates, so it needs to read a lot of files.
So you need to figure out what it is. When does it spin, how often does it spin, it it regular or random, etc.
If you know your way around telnet, you can also connect to the box, stop Enigma using "init 4", and then start Enigma again on the commandline using "/usr/bin/enigma2.sh". This will output all Enigma log, so you can see what it happening when you see "mainloop is busy, displaying spinner!" in the logs.
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