Something

#!/bin/bash

ld=$(cut -d" " -f1 /proc/loadavg)
echo $ld

#ld=15.80

if [[ $(bc <<<"$ld > 12.00") != 0 ]] ;then
ld1=$ld
echo $ld1
sleep 60
if [[ $(bc <<<"$ld = $ld1") != 0 ]] ;then

-command to restart interface here-

fi
fi