Wifi Dongle MT7601U connection issue

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Wifi dongle connects, but the internet is unstable. Sometimes it’s really good but seconds after, it stops or became really slow. Then a minute after, it returns to normal.
It happens with two different wifi routers I tried, but it doesn’t happen when I’m using my mobile phone as a router.
I’m using Ubuntu 18.04.4 with kernel 4.15.0-108-generic.
There is an anormal amount of excessive retries and invalid misc showing on iwconfig.
iwconfig:
wlx20e6170547f3 IEEE 802.11 ESSID:”IV2″
Mode:Managed Frequency:2.462 GHz Access Point: 00:1A:3F:8C:EF:DC
Bit Rate=54 Mb/s Tx-Power=20 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=69/70 Signal level=-41 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:2162 Invalid misc:15348 Missed beacon:0

ifconfigf:
wlx20e6170547f3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.117 netmask 255.255.255.0 broadcast 10.0.0.255
inet6 fe80::e14f:6814:691f:ae65 prefixlen 64 scopeid 0x20<link>
ether 20:e6:17:05:47:f3 txqueuelen 1000 (Ethernet)
RX packets 1597397 bytes 1916774385 (1.9 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 953376 bytes 114675969 (114.6 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

sudo lshw -C network:
*-network
description: Wireless interface
physical id: 3
bus info: [email protected]:1.2
logic name: wlx20e6170547f3
serial: 20:e6:17:05:47:f3
capacity: ethernet physical wireless
configuration: broadcast=yes driver=mt7601u driverversion=4.15.0-108-generic firmware=N/A ip=10.0.0.117 link=yes multicast=yes wireless=IEEE 802.11

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Marisa

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