diff --git a/psi-alerts.sh b/psi-alerts.sh
index fc6bc0b..4259e47 100755
--- a/psi-alerts.sh
+++ b/psi-alerts.sh
@@ -282,7 +282,6 @@ while true; do
                     integer elapsed=$(( now - ${secs[${alarm}]} ))
                     if is_clear "${alarm}" && (( elapsed >= 300 )); then
                         current_alarms=$(sed -E "s/${alarm}\|?//" <<< "${current_alarms}")
-                        last_alarm=$(awk -F'|' '{print $NF}' <<< "${current_alarms}")
                         unset "notice_sent[${alarm}]"
                         unset "secs[${alarm}]"
                     fi
@@ -296,21 +295,23 @@ while true; do
         continue
     fi
     last_line="${line}"
-    local psi_type="$(grep -Eo "(CPU|MEM|IO) PSI event" <<< "${line}" | grep -Eo "CPU|MEM|IO")"
-    if [[ -n "${psi_type}" ]]; then
-        secs+=(${psi_type} ${now})
-        if [[ ! ${notice_sent[${psi_type}]} ]]; then
-            last_dunst_id=$(exec_notices "${psi_type}" "${current_alarms}")
-            notice_sent+=(${psi_type} true)
-        elif (( last_dunst_id >= 0 )) && check_dunst_id_is_visible "${last_dunst_id}"; then
-            sleep 1
-            continue
-        fi
-        if [[ -z "${current_alarms}" ]]; then
-            current_alarms="${psi_type}"
-        else
-            if ! grep -q "${psi_type}" <<< "${current_alarms}"; then
-                current_alarms="${current_alarms}|${psi_type}"
+    if (( time_diff < 3 )); then
+        local psi_type="$(grep -Eo "(CPU|MEM|IO) PSI event" <<< "${line}" | grep -Eo "CPU|MEM|IO")"
+        if [[ -n "${psi_type}" ]]; then
+            secs+=(${psi_type} ${now})
+            if [[ ! ${notice_sent[${psi_type}]} ]]; then
+                last_dunst_id=$(exec_notices "${psi_type}" "${current_alarms}")
+                notice_sent+=(${psi_type} true)
+            elif (( last_dunst_id >= 0 )) && check_dunst_id_is_visible "${last_dunst_id}"; then
+                sleep 1
+                continue
+            fi
+            if [[ -z "${current_alarms}" ]]; then
+                current_alarms="${psi_type}"
+            else
+                if ! grep -q "${psi_type}" <<< "${current_alarms}"; then
+                    current_alarms="${current_alarms}|${psi_type}"
+                fi
             fi
         fi
     fi