errors and dropped packets

why am I getting errors and dropped packets??

wg0: flags=209<UP,POINTOPOINT,RUNNING,NOARP>  mtu 1420
        inet 10.9.0.1  netmask 255.255.255.0  destination 10.9.0.1
        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 1000  (UNSPEC)
        RX packets 539  bytes 97208 (97.2 KB)
        RX errors 9  dropped 84  overruns 0  frame 9
        TX packets 564  bytes 258916 (258.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

errors seem to have gone away after doing manual install and rebooting

do you think the MTU should be 1500? that's what I'm showing on windows 10 and on ubuntu eth0 is also mtu 1500

when I tried this, it goes back to 1420 after reboot

ip link set mtu 1500 dev wg0