Yes, you have to recreate the record.
If the record is empty - the DNS Master is unable to send the new updated records to the slaves and that renders your zone unusable when you are updating other records because they are not propagated.
What mobile client do you use?
Well, your device is behind a NAT so you are getting a class A network, it is quite common
Sorry that is caused problems, but they automatic job is running every few hours and it is to have a healthy DNS-environment.
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