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Why is it so ?

Zen Master III
I have recently had a couple of bugs,bug one, when talking over Bluetooth they could not understand me,bug two, when this bug would occur android auto could not understand my voice commands when using the button on my steering wheel or multi media unit. The only fix I could find was a hard reset until today. Today it happened again but this time I simply cleared all caches and like it was done with mirrors or magic it went back to normal.
Why is this happening. I understand,or at least I think I understand, what a cache is but I don't understand why my phone would play up when the relevant caches are full?
If someone could shed some light on this I would be in their debt