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My wireless connection keeps randomly disconnecting. Sometimes it connects back after few seconds, and sometimes not.

Sometimes I have to run sudo service network-manager restart, otherwise it won't reconnect until system reboot.

I've faced this problem on both Ubuntu 14.04.3 and Ubuntu 15.04.

The following is a result from iwconfig, my WiFi card is: Ralink RT5390.

IEEE 802.11bgn  ESSID:"BTHub5-J27X"  
Mode:Managed  Frequency:2.412 GHz  Access Point: 00:84:B0:EB:E5:E8   
Bit Rate=65 Mb/s   Tx-Power=20 dBm   
Retry short limit:7   RTS thr:off   Fragment thr:off
Power Management:off
Link Quality=65/70  Signal level=-45 dBm  
Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
Tx excessive retries:32  Invalid misc:60   Missed beacon:0


uname -r
3.19.0-28-generic


lspci
03:00.0 Network controller: Ralink corp. RT5390 Wireless 802.11n 1T/1R PCIe

lspci -knn | grep Net -A2
03:00.0 Network controller [0280]: Ralink corp. RT5390 Wireless 802.11n 1T/1R PCIe [1814:5390]
Subsystem: AzureWave Device [1a3b:1155]
Kernel driver in use: rt2800pci

Furthermore, the connection on my Android device is stable.

Your help is very appreciated.

  • Please edit your question and add output of lspci -knn | grep Net -A2 terminal command. – Pilot6 Sep 15 '15 at 17:47
  • I think this may be a driver problem.I wonder it will be helpful when you update the latest kernel. – Li Hao Sep 16 '15 at 15:22
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This is a hardware level problem . Probably your wireless chip can't catch the frequencies properly . I had a similar issue . you probably have to dissemble your device . There is two plug connected with the wireless chip . Check if they are ok . If they are then try disconnecting them . before disconnecting please remember which one is connected to which socket . then reconnect them . see if it works . If it doesn't then probably your wireless lan is faulty . you have to replace it with new one .

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try switching the driver (from rt2800pci) to rt2860sta, see here and here.

if that doesn't help, might need to check/update firmware (e.g. # apt-get update && apt-get install firmware-ralink.

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Ive seen disconnects being caused by faulty power saving capabilities of the driver/chip

To quickly check if this is the case

try:

 sudo iwconfig wlan0 power off

and see if you see any difference. Make note that this will not change your settings permanently. So they will be reset on suspend & reboot

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