Caldav reload fails

Setup, Configuration and Use Runtime
1

Hi,
I use caldavio to check my google calendar for waste disposal dates. I look for the next 3 upcoming events. reload interval is 360 minutes (could be even longer). The item definitions are:

String CalDav_Muelltonne_1   "Tonne [%s]"  <calendar> { caldavPersonal="calendar:Abfallentsorgung type:EVENT eventNr:1 value:NAME" }
DateTime    CalDav_Muell_Date_1 "[%1$td.%1$tm.%1$tY]"    <calendar>    { caldavPersonal="calendar:Abfallentsorgung type:EVENT eventNr:1 value:START" }
String CalDav_Muelltonne_2   "Tonne [%s]"  <calendar> { caldavPersonal="calendar:Abfallentsorgung type:EVENT eventNr:2 value:NAME" }
DateTime    CalDav_Muell_Date_2 "[%1$td.%1$tm.%1$tY]"    <calendar>    { caldavPersonal="calendar:Abfallentsorgung type:EVENT eventNr:2 value:START" }
String CalDav_Muelltonne_3   "Tonne [%s]"  <calendar> { caldavPersonal="calendar:Abfallentsorgung type:EVENT eventNr:3 value:NAME" }
DateTime    CalDav_Muell_Date_3 "[%1$td.%1$tm.%1$tY]"    <calendar>    { caldavPersonal="calendar:Abfallentsorgung type:EVENT eventNr:3 value:START" }

The rule triggers on systemstart and every day at 5 p.m. It works, I checked it with logInfo.

when Time cron "0 0 17 * * ?" or Item systemstarted changed from ON to OFF
 then
    {
      var String Abfallart_1=CalDav_Muelltonne_1.state.toString  // welche Tonne
      var String Abfallart_2=CalDav_Muelltonne_2.state.toString
      var String Abfallart_3=CalDav_Muelltonne_3.state.toString
 ............

These are the item values today (03/07):
grafik

The first entry is in the past. These items will never be refreshed until OH restart.

To be complete, here are the relevant caldavio.cfg lines:

caldavio:Abfallentsorgung:reloadInterval=360
caldavio:Abfallentsorgung:preloadTime=12000  
caldavio:Abfallentsorgung:lastModifiedFileTimeStampValid=true
caldavio:Abfallentsorgung:disableCertificateVerification=true

I tried to change the TimeStampValid flag to “false” - no other result. openhablog shows no errors.
What’s going wrong?

Thanks for your help

Ulrich