I have a ZMAX Pro that I've had for 6yrs. It has always had a solid 4 bars inside the house until recently. I noticed the signal strength has been dropping to zero every few seconds and the 4G icon flickers as if it drops out and re-establishes signal. This is happening all around my house. My battery is getting drained from 100% to 15% in 7-8 hours with the phone just idling. I guess the drain is caused by the network always dropping out and reconnecting. Can this be a sim card issue? I already cleaned it with rubbing alcohol but it made no difference.
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