tv_grab_pt_meo error: 500 Internal Server Error

Hello,

Since about one week ago the pt_meo grabber consistently produces this 
error:

~$ tv_grab_pt_meo --config-file /home/mythtv/.mythtv/zon_meo.xmltv --days 1
requesting 
http://services.sapo.pt/EPG/GetChannelListByDateInterval?channelSiglas=RTP1%2CRTP2%2CSIC%2CTVI%2CSICN%2CSICM%2CSICR%2CRTPM%2CRTPA%2CEURSP%2CPANDA%2CHOLLW%2CAXN%2CFOX%2CMTV%2CTVREC%2CDISCV%2CODISS%2CNGC%2CHIST%2CBIOG%2CVH1%2CMEZZO%2CEURN%2CCNN%2CBBC%20W%2CFLIFE%2CTVI24%2CBBC%20E%2CRTPIN&startDate=2013-09-03%2000:00:00&endDate=2013-09-03%2023:59:59
could not fetch 
http://services.sapo.pt/EPG/GetChannelListByDateInterval?channelSiglas=RTP1%2CRTP2%2CSIC%2CTVI%2CSICN%2CSICM%2CSICR%2CRTPM%2CRTPA%2CEURSP%2CPANDA%2CHOLLW%2CAXN%2CFOX%2CMTV%2CTVREC%2CDISCV%2CODISS%2CNGC%2CHIST%2CBIOG%2CVH1%2CMEZZO%2CEURN%2CCNN%2CBBC%20W%2CFLIFE%2CTVI24%2CBBC%20E%2CRTPIN&startDate=2013-09-03%2000:00:00&endDate=2013-09-03%2023:59:59, 
error: 500 Internal Server Error, aborting

After some tests, reducing the number of channels, some times it works:

~$ tv_grab_pt_meo --config-file /home/mythtv/.mythtv/zon_meo.xmltv --days 1
requesting 
http://services.sapo.pt/EPG/GetChannelListByDateInterval?channelSiglas=RTP1%2CRTP2%2CSIC%2CTVI%2CSICN%2CSICM%2CSICR%2CRTPM%2CRTPA%2CEURSP&startDate=2013-09-03%2000:00:00&endDate=2013-09-03%2023:59:59
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE tv SYSTEM "xmltv.dtd">

<tv 
source-info-url="http://services.sapo.pt/Metadata/Service/EPG?culture=EN" source-info-name="SAPO 
EPG Service for MEO" generator-info-name="XMLTV/$Id: tv_grab_pt_meo,v 
1.4 2010/12/10 18:48:30 dekarl Exp $" 
generator-info-url="http://www.xmltv.org/">
   <channel id="rtp1.tv.sapo.pt">
......

Some times it doesn't.

I made some changes last year, instructed by dekarl, to accommodate the 
domain name change and grab just one day at a time, and it worked for 
more than a year; suddenly it's failing; read here:

https://sourceforge.net/mailarchive/forum.php?thread_name=BLU0-SMTP3402A31B70E5133D8C3C873D0580%40phx.gbl&forum_name=xmltv-users

Can anybody please help?

TIA
jss

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