diff --git a/power.sh b/power.sh
index 40696b5..5e32f41 100644
--- a/power.sh
+++ b/power.sh
@@ -5,9 +5,13 @@ set -eu
 
 QEMU_MONPORT=7100
 QEMU_POWERDOWN_TIMEOUT=50
+
 _QEMU_PID=/run/qemu.pid
 _QEMU_SHUTDOWN_COUNTER=/run/qemu.counter
 
+rm -f "${_QEMU_PID}"
+rm -f "${_QEMU_SHUTDOWN_COUNTER}"
+
 # Allows for troubleshooting signals sent to the process
 _trap(){
     func="$1" ; shift
@@ -19,7 +23,9 @@ _trap(){
 _graceful_shutdown(){
 
   local QEMU_MONPORT="${QEMU_MONPORT:-7100}"
-  local QEMU_POWERDOWN_TIMEOUT="${QEMU_POWERDOWN_TIMEOUT:-120}"
+  local QEMU_POWERDOWN_TIMEOUT="${QEMU_POWERDOWN_TIMEOUT:-50}"
+
+  [ -f "${_QEMU_SHUTDOWN_COUNTER}" ] && return
 
   set +e
   echo "Received $1 signal, shutting down..."
@@ -64,7 +70,7 @@ _graceful_shutdown(){
   done
 
   echo "Quitting..."
-  echo 'quit' | nc -q 1 -w 1 localhost "${QEMU_MONPORT}">/dev/null || true
+  echo 'quit' | nc -q 1 -w 1 localhost "${QEMU_MONPORT:-7100}">/dev/null || true
 
   return
 }