Have to reboot Vodacom wireless modem too often

I cancelled my Telkom ADSL after many years of service because when it went down once a year it would stay down for 3 weeks or more and take me a year each time to recover financially due to running a small business reliant on internet.<br> I am now paying up to 5 times more for a Vodacom wireless modem than I did for a Telkom ADSL line and have not experienced any downtime yet and have much, much faster speed.<br> What is quite annoying though is that the line goes down at least 5 times a day and I the only thing that brings the line back is if I remove the battery and the sim, wait a couple of seconds, put them back in again, switch the modem back on and problem solved. But why does this happen for 5 times the price that I paid for useless Telkom?