Every user who uses a modem connection to access the Internet sooner or later faces such a problem as spontaneous reboot of the modem. This behavior of the device can be caused by a number of reasons.
Most likely, the reason for the spontaneous reboot is the increased temperature of the modem. Take the modem in hand and check if it is very hot. Try directing a fan at the modem during operation, or placing it in a cool place, such as on a windowsill. Another possible factor is insufficient mains voltage. Check the modem power supply for damage, read its technical specifications. Perhaps, its capacity is not enough for normal supply of the modem with electricity. The third reason for spontaneous reboot may be outdated modem firmware. Check for the latest software for your modem on the manufacturer's official website. If there is a more recent version, please update it. Communication problems can also affect the modem in a bad way. Line faults can cause conflicts between your modem and the provider's equipment, as a result of which you can observe a spontaneous reboot of the device. A hardware malfunction of the modem can also cause such reboots. Try to connect it to another computer and check it works. Malicious software (viruses) can also cause the modem to restart itself spontaneously. Check your computer for viruses. It is worth noting that an unsuccessful firmware update may cause the modem to malfunction. Before performing this operation, carefully read the documentation of the modem, and it is better to contact the service center. If the above tips did not help, you should contact the specialists.