Serious routing problems when connecting some devices

I recently bought and EdgeRouter X for my internet connection (Telefonica 300Mbit fiber with iptv) and performance, specially with hwnat is stellar, something that my older 751G-2HnD cannot achieve as it is too slow, or with the trash routers that any isp provides.
However it is giving me some serious connectivity troubles.

My configuration is the following

OF <=> ONT (eth0) <=> (eth0) ERX (eth1) <=> Mikrotik (as full bridge, for the wifi) 
           (rj11) <=> Phone      (eth2) <=> IPTV        
                                 (eth3) <=> Server
                                 (eth4) <=> Personal computer

If I plug my personal computer to the port (which is completely off btw), routing performance plummets. I see that right away because iptv image gets corrupted with tons of drops. Even connecting to the router through ssh results in an extremely laggy experience. The same happens if I switch ports around.

I suspect this is not an issue with my computer, because it works fine with the movistar router, and this very same issue appeared with my server (my computer was fine at the time) before I restored the configuration and changed ports in my server.

If I plug my computer into a free mikrotik port, everything works.

Additionally there is the following kernel panic in the logs:

------------[ cut here ]------------
WARNING: at kernel/softirq.c:160 local_bh_enable_ip+0x88/0xc4()
Modules linked in: nf_nat_rtsp(O) nf_conntrack_rtsp(O) hw_nat xt_nat xt_set 8021q garp stp llc ipt_MASQUERADE xt_comment xt_conntrack xt_TCPMSS xt_tcpudp ip6table_mangle ip6table_filter ip6table_raw ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 iptable_mangle xt_CT iptable_raw nf_nat_pptp nf_conntrack_pptp nf_conntrack_proto_gre nf_nat_h323 nf_conntrack_h323 nf_nat_proto_gre nf_nat_tftp nf_nat_ftp nf_nat nf_conntrack_tftp nf_conntrack_ftp nf_conntrack ip_set_hash_net ip_set nfnetlink iptable_filter ip_tables x_tables ipv6 crypto_k(P) imq ubnt_nf_app(PO) tdts(PO) pptp gre pppoe pppox ppp_generic slhc tun ubnt_platform(PO) [last unloaded: nf_conntrack_sip]
CPU: 1 PID: 0 Comm: swapper/1 Tainted: P           O 3.10.14-UBNT #1
Stack : 804b7c32 00000044 00000000 80460000 8040c100 00000600 8040a19c 804b3b9c
          8fc5b3e8 80463527 8040c100 00000600 00000081 8ce6a03a c0176724 80377810
          8046f054 80028168 00000000 00000000 8040bebc 8fc63854 8fc63854 8040a19c
          00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
          00000000 00000000 00000000 00000000 00000000 00000000 00000000 8fc637e8
          ...
Call Trace:
[<80009990>] show_stack+0x64/0x7c
[<8002832c>] warn_slowpath_common+0x78/0xa8
[<80028374>] warn_slowpath_null+0x18/0x24
[<800310d4>] local_bh_enable_ip+0x88/0xc4
[<c3df9140>] destroy_conntrack+0xe0/0x180 [nf_conntrack]
[<802e7378>] nf_conntrack_destroy+0x20/0x2c
[<802ab654>] skb_release_head_state+0x140/0x280
[<802ab7f0>] __kfree_skb+0x5c/0x1b8
[<802965cc>] ei_start_xmit+0xd8/0x304
[<80297ddc>] vlan0_start_xmit+0x10c/0x198
[<802bd5c8>] dev_hard_start_xmit+0x468/0x570
[<802d80cc>] sch_direct_xmit+0x10c/0x2c4
[<802bd8cc>] dev_queue_xmit+0x1fc/0x5b4
[<c408c958>] vlan_dev_hard_start_xmit+0xa4/0x1ac [8021q]
[<802bd5c8>] dev_hard_start_xmit+0x468/0x570
[<802bdaa8>] dev_queue_xmit+0x3d8/0x5b4
[<c018ac44>] __pppoe_xmit+0x150/0x1c8 [pppoe]
[<c0171f7c>] ppp_push+0x3f4/0x6d0 [ppp_generic]
[<c0173668>] ppp_xmit_process+0x560/0x74c [ppp_generic]
[<c01739dc>] ppp_start_xmit+0x188/0x1dc [ppp_generic]
[<802bd5c8>] dev_hard_start_xmit+0x468/0x570
[<802d80cc>] sch_direct_xmit+0x10c/0x2c4
[<802bd8cc>] dev_queue_xmit+0x1fc/0x5b4
[<802f4fdc>] ip_finish_output+0x33c/0x4fc
[<802b6ca0>] __netif_receive_skb_core+0x744/0x954
[<802ba5e8>] process_backlog+0xbc/0x1bc
[<802badec>] net_rx_action+0xe8/0x1e8
[<80030e64>] __do_softirq+0x124/0x224
[<800312d8>] irq_exit+0x78/0x84
[<8000436c>] ret_from_irq+0x0/0x4
[<80005e98>] __pastwait+0x0/0x8
[<80064d04>] cpu_startup_entry+0xc4/0x190

---[ end trace f57545fbd22ee4cd ]---

My initial configuration is taken from the following page Ubiquiti ADSLZone Movistar scripts, specifically this file. It is in spanish but you're probably old acquaintances.

I have attached my current config.boot anyways.

I'm fully open to suggestions to debug this problem.