diff --git a/chch-calendar.sh b/chch-calendar.sh
index 137196a..d3a72cb 100755
--- a/chch-calendar.sh
+++ b/chch-calendar.sh
@@ -7,22 +7,28 @@ WIKI_PATH="/var/www/chch/"
 RAND="$(date +%s)$RANDOM$RANDOM$RANDOM"
 CHCH_ICAL_TMP="/tmp/chch_$RAND.ical"
 CHCH_ICAL_FAIL="/tmp/chch_ical_wget_failed"
+CHCH_ICAL_FAIL_WARN_SENT="/tmp/chch_ical_wget_warned"
+CHCH_ICAL_FAIL_WARN_DELAY=60 # miniutes
 
 rm -rf /tmp/chch_*.ical
 wget "$CHCH_ICAL_SRC" -O "$CHCH_ICAL_TMP" -q -T 45 -t 1
 if [ $? -ne 0 ]; then
 	if [ ! -f "$CHCH_ICAL_FAIL" ]; then
-		echo "ERROR: wget failed to download calendar" >&2
 		touch "$CHCH_ICAL_FAIL"
 	fi
+	if [ ! -f "$CHCH_ICAL_FAIL_WARN_SENT" ] && test "$(find "$CHCH_ICAL_FAIL" -mmin +$CHCH_ICAL_FAIL_WARN_DELAY)"; then
+		echo "ERROR: wget failed to download calendar" >&2
+		touch "$CHCH_ICAL_FAIL_WARN_SENT"
+	fi
 else
 	mv "$CHCH_ICAL_TMP" "$CHCH_ICAL" >/dev/null 2>&1
-	if [ -f "$CHCH_ICAL_FAIL" ]; then
+	if [ -f "$CHCH_ICAL_FAIL_WARN_SENT" ]; then
 		echo "INFO: wget recovered from previous error" >&2
-		rm -rf "$CHCH_ICAL_FAIL"
 	fi
+	rm -rf "$CHCH_ICAL_FAIL"
+	rm -rf "$CHCH_ICAL_FAIL_WARN_SENT"
 fi
-
+rm -rf "$CHCH_ICAL_TMP"
 
 # this requires -> icalparser from https://github.com/OzzyCzech/icalparser.git
 head $CHCH_ICAL -n1 >/dev/null 2>&1 && php "$SCRIPT_DIR/include/chch_ical2mediawiki.php" "$CHCH_ICAL" 2>/dev/null | php "$WIKI_PATH/maintenance/edit.php" -m -b --no-rc -s "automatische Aktualisierung aus dem ical feed" "Aktuelle_ChCh-Termine" >/dev/null 2>&1