tiviar alpha+ box


Just bought myself a tiviar alpha+ box to replace my zgemma s2
all running fine with wooshbuild install.
can someone tell me if its better sound using a SPDIF(optical cable) for sound.
at the moment i have the box connected to my av amp using HDMI cable.
also any ideas why a blue circle on the top left screen keeps appearing and disappearing every 10mins or so ?
thanks advance
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