What is the average lifespan of an Avalon 1166 Pro 81TH?

Anyone with the experience know what one can expect in terms of the lifespan of an Avalon 1166 Pro miner?

Also, secondarily, which mining pool do you recommend for the most BTC rewards?

mine lasted about 12 hours.
First hashboard died within a day. Second hasboard died within a week.
I’ve been trying get ahold of someone at Canaan for warranty but unsuccessful for weeks…

support@canaan.io verifies it is under warranty and that 2 hashboards need RMA then refer me to domestic service team for RMA ,the hotline is 010-69706624. When I try to call I get no english and hangup.

Anybody have a contact?

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