D220 wireless connection

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One other thought: how far away from your router/access point is your 220? If it's more than a couple of metres, maybe the wireless signal is just too weak for the 220 to use reliably.

Assuming you don't have the CI upgrade, the wi-fi antenna is completely inside the 220's metal casing, which is less than ideal, so the 220 "sees" much lower wi-fi signal strength than other equipment in the same place.