Collect modem registration state, serving band and cell, RSRP, RSRQ, SINR, assigned IP, APN, session uptime, disconnect reason and data counters. Router system logs should show reboots, power events, WAN health-check failures, SIM switches, VPN changes and DHCP or DNS errors.
Record supply voltage and temperature where available, plus timestamps from the connected application. Compare faults with carrier outages and busy periods. One screenshot after service returns is rarely enough; a time series or exported log can reveal whether the issue is radio quality, power, configuration or application behaviour.
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Which logs and status readings are most useful when diagnosing an intermittent cellular connection?
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