After one year of trouble-free operation, no WLAN is generated by the WebBoat 4G lite. When powering up, the power on LED is on, all 5 cellular signal strength LEDs are on, the 3 LEDs between the two are flashing differently. After a while the power-on LED is on, of the three only the right LED flashes, the signal strength of the mobile network is displayed (e.g. 3 LEDs). But no WLAN with the name webboat_XXXX is established. A factory reset brought no changes. Access via the app is also not possible. The antenna cable to the WLAN antenna is o.k. No short circuit. What could be the solution to solve this problem? Thanks in advance, best regards, Thorsten.