I found out I can disable/enable addon using JSON-RPC and also I can do it using the Sleep/Resume script per LibreELEC wiki. What I did was create a script named 01-restart_pvr_client.power, created "sleep.d" folder in ".config" folder, put the script there. Now it executes upon Resume and it first disables TVH PVR Client then enables it after 10 seconds. This fixes my problem for now.
Bash
#!/bin/sh
case "$1" in
pre)
# do something on suspend
;;
post)
# do something on resume
curl -d '{"jsonrpc":"2.0","method":"Addons.SetAddonEnabled","params":{"addonid":"pvr.hts","enabled":false},"id":1}' -H 'Content-Type: application/json' http://localhost:5555/jsonrpc
sleep 10
curl -d '{"jsonrpc":"2.0","method":"Addons.SetAddonEnabled","params":{"addonid":"pvr.hts","enabled":true},"id":1}' -H 'Content-Type: application/json' http://localhost:5555/jsonrpc
;;
esac
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