We have a big complaint about DSTV service, as we frequently get error 16 or 48

We have a big complaint about DSTV service, as we frequently get error 16 or 48. Phoning to the Multichoice help centre gets the same answer: check and disconnect your cables on the rear of the decoder, check the LNB on the dish and get an installer to check it. This will cost me a lot and take days to do, while I miss a lot of programming I pay for. I usually simply switch off the DSTV decoder and let it reboot and everything will work. My complaint is why does this happen so often on both our old primary Ultra and new Extra-view Ultra DSTV decoders. There must be glitches in the Multichoice system and this is very irritating.