This could be because you are below the 10,000 feet threshold where the service switches off. Or occasionally, you could be passing between satellite beams whereby the signal sometimes can be lost temporarily, just like moving between cell phone points on the ground. Also, a few territories do not yet allow this service over their airspace. Our advice, just like on the ground, would be to wait a little while and try again, by which time the signal may be restored.
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