https://devzone.nordicsemi.com/f/nordic-q-a/81484/modem-can-t-connect-lte-after-30-times-on-offHi I known that for NB IoT networks, a device can only be attached and separated 30 times in 1 hour. If the number exceeds the number of times, the modem will have to wait until the next hour to continues connecting. But when I reboot the device,en-USTelligent Community 13Tue, 09 Nov 2021 09:06:00 GMThttps://devzone.nordicsemi.com/thread/338073?ContentTypeID=1Tue, 09 Nov 2021 09:06:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:108b4488-0dfd-4916-9a90-a92d1680cb33Kazi Afroza Sultana<p>Hello Hoang,</p> <p>You have to keep the network alive as I said before. You can use Power Saving Mode (PSM).&nbsp;</p> <p>BR</p> <p>Kazi</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/337869?ContentTypeID=1Mon, 08 Nov 2021 10:06:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b90cd110-3977-4f11-8bc8-f9e1d1b57016haohv6<p>Because some reason, I had to turn off and turn on the modem constantly, Do you have any idea?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/337865?ContentTypeID=1Mon, 08 Nov 2021 10:02:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:581d7cff-03fe-48d5-a793-5ec0bbaa7d2dKazi Afroza Sultana<p>Hello Hoang,</p> <p><span>Thanks for your query. I think you should keep the connection on instead of immediately disconnecting and turning off the modem. It seems like you have been disconnecting from the LTE network each time sending data. The frequent amount of doing this will block the modem connection. such as &#39;denial of service&#39;. Therefore the device can hamper the network to be connected.&nbsp;<span dir="ltr"></span></span></p> <p><span>You can try this (keep the connection on) and let us know the result.&nbsp;</span></p> <p><span>Best Regards,</span></p> <p><span>Kazi Afroza Sultana</span></p> <p><span>&nbsp;</span></p><div style="clear:both;"></div>