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I have got the following problem with my TP-link MR3420 and modem MA260.
When the modem loses the 3G/4G signal of the ISP (specially in bad wheather conditions) I succeed to connect a device to the router only through an ethernet cable. If I try to connect my smartphone, it seems that the connection is established but in fact it is not.
In such circumstances the usual icon that shows the wifi connection has an added exclamation mark , which reveals a connection problem.
Only after the MA260 modem regains the 3G/4G signal, I can establish a WiFi connection to the router
What am I missing ?