Disconnecting mid-quest (Monster Hunter)

[SickoDave]

I didn't want to make a new thread but I've look everywhere and can't seem to find a solution. Me and a friend have been trying to play Monster Hunter online, we've tried both Freedom Unite and Portable 3rd.

The problem we have is, we can connect to each other no problem. We see each other in the guild hall, we sign up for quests and we can start them no problem. The game loads fast and we're in. Mid way through the quest, my friend disconnects and is kicked back to the guild hall. It is always him and not me. Sometimes this happens after 2 minutes but sometimes longer, the longest we have gone is nearly 15 minutes. We've tried around 20 times and only managed to complete 2 quests. We have both tried hosting and it is still only him that disconnects.

We are using Tunngle and both have forwarded ports to give us a open connection (green face) as well as other ones (10000 and 20001-20004 I think they are). We have both allowed the apps through the firewalls as well disabling them altogether. As far as I am aware we are using the same versions of PPSSPP and the games. We're also using the same settings, with cheats and fast memory disabled as well as unmapping unthrottling etc.

I've looked everywhere but I am struggling to find more suggestions to try out. As far as I know his internet is fine and doesn't suffer disconnecting elsewhere. If anybody has any ideas we can try, we'd be very grateful. We're desperate to play! Is there a specific PPSSPP build we should use, or any settings disabled we've not tried? Or another VPN? Any ideas would be great.