SSH and NFS shares not working properly on OpenELEC

This is driving me insane.

I have a PC running Ubuntu Server with NFS shares properly set up. I know they work because I was able to use them with my Pi, however after dealing with access issues I decided to format the SD and start from scratch.
So, what I have right now is: Raspberry 2 with official power supply and less than 3 months old class 10 SD card; fresh openelec stable release image; no extra addons or configs, just the pi connected to same wifi network as the server PC.

I managed to add the NFS shares, browse their content and watch 2 or 3 seconds of a video. Then the playback stopped and I had to force reset the Pi. Since then SSH connection has been working poorly (I can’t log in most of the time and when I can it stops working after 2 or 3 seconds/commands) and I can’t no longer access the NFS shares or scan to add them again.

I know there’s a lot of posts with these kind of problems but most of them end up being solved by adjusting the permissions on the server’s side or something like that. Here I know that those are OK, and I know I should be able to stream video (at least with lag, I’ll worry about that later).

Previous to this installation I tried the 6.95 beta release but ran into the same problems AND the wifi connection wasn’t stable either: I kept getting association errors. Now wifi seems to be fine.

wifi dongle is a TP-Link TL-WN725N which I’ve been using for years now and I know it can handle fairly high bitrate video stream. I’m using an ASUS RT-AC66U router and both my Pi and the server have static IPs. This is the content of my /etc/exports file:

Code:
/home/achus/share   192.168.1.0/24(rw,async,insecure,no_subtree_check)

/home/achus/disco   192.168.1.0/24(rw,async,insecure,no_subtree_check,all_squash,anonuid=1000,anongid=1000)

thanks for reading