prevent hardware watch dog reset

[manfred-ackermann]

Something fires the hardware watch dog reset. Reason has to be investigated.

INFO: GSM SIM800L READY
CRIT: NO POWER!, Vbat: 4.13v
WARN: ONLY VISUAL ALERT (NO BEEPER, NO ALERT SMS)
INFO: PRESS 'b' (b)oot reason.
            'h' show this (h)elp.
            'm' to set new alert short (m)essage.
                e.g. BLACKOUT AT HOME!
            'n' to set new alert mobile (n)umber for alert message.
                e.g. 612345678 or 00491517346592
            's' for (s)tatus information (Vbat, alert mobile number and msgs).
            't' to set send (t)est alert message.
      All other chars will be send to SIM800L (e.g. AT<CR>).
INFO: Reset reason => hardware watch dog reset