[all variants] Ralink RT3290LE: low sensitivity, connection loss and causes reboot of system

Problems with "Ralink RT3290LE 802.11bgn 1x1 Wifi and Bluetooth 4.0 Combo Adapter" and ubuntu 16.04:

1- If the wifi card is turned on when you order shutdown of the system (from terminal, shutdown button, etc.), the result is always a restart. To shutdown the laptop, one must disable previously the wifi card.

2- Low sensitivity to wifi signal, sometimes losing connection intermittently. In my case, at 3 meters from the router, without obstacles in between, signal strength ranges from only 51 to 63%. Speed tests show really lower speed, specially for download (I compared this card with an usb wifi dongle)

3- Sometimes the wifi card loses the connection and remains deactivated, no matter what you do; if you simply restart the system, it is impossible to turn it on; by contrast, if you make a shutdown instead of a restart, the wifi card works again.

I'm experiencing all of these issues with a HP Envy m6-1202ss and ubuntu 16.04. Lower sensitivity and connection loses are there since ubuntu 15.04. Restarts of the system when you want to shutdown, I think began with update to kernel 3.9., also in 15.04.

Probably all is related with the kernel driver.

I transiently "solved" all the problems by using a TP-Link Nano Usb Adapter (TL-WN725N), which runs perfectly, and disabling the PCI wifi card.

Hope someone can find a real solution for a persistently (as I've seen from other posts) problematic wifi card. I've tried previously and unsuccessfully, among others: https://ubuntuforums.org/showthread....2104129&page=2,
https://ubuntuforums.org/showthread....=ralink+rt3290, http://askubuntu.com/questions/25823...hp-envy-7212nr, http://onthim.blogspot.com.es/2015/0...driver-on.html

Thank you in advance

Attachment 270877

Info supplied by "sudo lshw -class network":
*-network
description: Wireless interface
product: RT3290 Wireless 802.11n 1T/1R PCIe
vendor: Ralink corp.
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlo1
version: 00
serial: b8:76:3f:3a:49:fd
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=rt2800pci driverversion=4.4.0-21-generic firmware=0.37 ip=192.168.1.50 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:17 memory:f0110000-f011ffff