I had my sn margin drop alot when they changed me to adsl2+ and the internet was unusable but my modem was faulty , when I tried a new modem the sn margin increased alot , this may not be the case for yougeekevo wroteAnytging I can do about it ali?The internet unusable in this state. Is anything like this happening to you vegtelab or john?
Try to troubleshoot by disconnecting the phones and trying another phone socket , then call cyberia and tell them about your case ( tell them that you got switched to adsl2+ , the support guys are stupid and will not know why your sn margin dropped)