Hi Ilario,
here info about the timeout. I read somewhere in the forum there is no other chance than go back to 19.07.3 or wait for 19.07.5.

LiMe master development (master rev. 5f6c75e 20201019_1924) / LuCI openwrt-19.07 branch git-20.287.57033-3d52019  

[ 1647.655283] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:320 0x802c39c0
[ 1647.662500] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[ 1647.669605] Modules linked in: rt2800soc rt2800mmio rt2800lib batman_adv rt2x00soc rt2x00mmio rt2x00lib nf_conntrack_ipv6 mt76x2e mt76x2_common mt76x02_lib mt76 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE ebtable_nat ebtable_filter ebtable_broute cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_FLOWOFFLOAD xt_CT nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache nf_conntrack macvlan libcrc32c iptable_mangle iptable_filter ip_tables ebtables ebt_vlan ebt_stp ebt_redirect ebt_pkttype ebt_mark_m ebt_mark ebt_limit ebt_ip6 ebt_among ebt_802_3 crc_ccitt compat nf_log_ipv6 nf_log_common
[ 1647.742155]  ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 leds_gpio gpio_button_hotplug crc16 crc32c_generic crypto_hash
[ 1647.756317] CPU: 0 PID: 0 Comm: swapper Not tainted 4.14.195 #0
[ 1647.762363] Stack : 8046dee0 80054358 80480000 8042d258 00000000 00000000 00000000 00000000
[ 1647.770917]         00000000 00000000 00000000 00000000 00000000 00000001 87c07de0 ac07f5da
[ 1647.779455]         87c07e78 00000000 00000000 00004d40 00000038 803ccd58 00000008 00000000
[ 1647.788005]         00000000 80460000 000b8a5d 00000000 87c07dc0 00000000 00000000 8042710c
[ 1647.796557]         802c39c0 00000140 8046df34 8046def4 00000002 80213fc0 00000000 805b0000
[ 1647.805111]         ...
[ 1647.807613] Call Trace:
[ 1647.807625] [<80054358>] 0x80054358
[ 1647.813714] [<803ccd58>] 0x803ccd58
[ 1647.817287] [<802c39c0>] 0x802c39c0
[ 1647.820859] [<80213fc0>] 0x80213fc0
[ 1647.824426] [<8000aa50>] 0x8000aa50
[ 1647.827982] [<8000aa58>] 0x8000aa58
[ 1647.831562] [<80026480>] 0x80026480
[ 1647.835120] [<802c39c0>] 0x802c39c0
[ 1647.838686] [<80026508>] 0x80026508
[ 1647.842257] [<8026c120>] 0x8026c120
[ 1647.845837] [<802c39c0>] 0x802c39c0
[ 1647.849402] [<802c385c>] 0x802c385c
[ 1647.852973] [<8005ffcc>] 0x8005ffcc
[ 1647.856531] [<800012fc>] 0x800012fc
[ 1647.860103] [<800601a0>] 0x800601a0
[ 1647.863683] [<8029d484>] 0x8029d484
[ 1647.867268] [<803d2808>] 0x803d2808
[ 1647.870839] [<8005a554>] 0x8005a554
[ 1647.874396] [<80055ab0>] 0x80055ab0
[ 1647.877969] [<80005e90>] 0x80005e90
[ 1647.881537]
[ 1647.883055] ---[ end trace 86c64958f59af127 ]---
[ 1647.887773] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
[ 1647.894098] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:80000065
[ 1647.900240] mtk_soc_eth 10100000.ethernet eth0: tx_ring=0, base=070d0000, max=1024, ctx=949, dtx=949, fdx=931, next=949
[ 1647.911269] mtk_soc_eth 10100000.ethernet eth0: rx_ring=0, base=070d4000, max=1024, calc=426, drx=428
[ 1650.197736] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
[ 1650.204086] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:80000065
[ 1650.210254] mtk_soc_eth 10100000.ethernet eth0: tx_ring=0, base=06a38000, max=1024, ctx=332, dtx=332, fdx=224, next=332
[ 1650.221280] mtk_soc_eth 10100000.ethernet eth0: rx_ring=0, base=06a24000, max=1024, calc=166, drx=167
[ 1652.403225] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
[ 1652.409575] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:80000065
[ 1652.415754] mtk_soc_eth 10100000.ethernet eth0: tx_ring=0, base=06a38000, max=1024, ctx=130, dtx=130, fdx=91, next=130
[ 1652.426697] mtk_soc_eth 10100000.ethernet eth0: rx_ring=0, base=070cc000, max=1024, calc=130, drx=132
[ 1656.116846] mtk_soc_eth 10100000.ethernet eth0: transmit timed out
[ 1656.123193] mtk_soc_eth 10100000.ethernet eth0: dma_cfg:80000065


--
Regards 
Jürgen