Thanks for the answers!
 Tonight everything got back to normal 

I think it was my own fault. I had previously messed with the power saving setting, since the computer seemed to be often on all through the day and evening even though no-one was using it. I had put hard disks to shut down after 30 mins and monitor after 20 mins. I dont know if they did, but now with "always on" settings the variance was again flat.
Another thing I did was defragmenting the hard disks... even though it was not necessary according to the analysis in the software.
Main thing is that it works 

Telia is not my ISP. My ISP (Welho) does not show the name on the traces.. dunno why.
The trace is still a bit weird, but it does not seem to affect the variance:
------------
Tracing route to 206.16.60.39 over a maximum of 30 hops
  1     *        *        *     Request timed out.
  2     9 ms    14 ms    16 ms  10.201.0.1
  3    11 ms    11 ms     8 ms  213.243.153.129
  4     9 ms     *        *     212.90.64.70
  5    11 ms    14 ms     9 ms  hls-b3-geth2-1-0-801.telia.net [213.248.78.161]
  6    39 ms    18 ms    16 ms  s-bb1-pos6-2-0.telia.net [213.248.64.101]
  7    32 ms    26 ms    29 ms  kbn-bb1-pos0-0-0.telia.net [213.248.65.25]
  8   123 ms   127 ms   121 ms  nyk-bb1-link.telia.net [80.91.249.24]
  9   122 ms   166 ms   113 ms  nyk-b1-link.telia.net [213.248.82.14]
 10   121 ms   123 ms   122 ms  telia-gw.n54ny.ip.att.net [192.205.32.89]
 11   166 ms   169 ms   168 ms  tbr2031701.n54ny.ip.att.net [12.122.80.238]
 12   168 ms   175 ms   171 ms  tbr2-cl15.wswdc.ip.att.net [12.122.10.54]
 13   171 ms   167 ms   168 ms  tbr1-cl17.attga.ip.att.net [12.122.10.70]
 14   189 ms   174 ms   173 ms  tbr2-cl1835.attga.ip.att.net [12.122.9.158]
 15   176 ms   177 ms   175 ms  tbr1-cl13.dlstx.ip.att.net [12.122.2.89]
 16   174 ms   170 ms   170 ms  br2-a340s8.dlstx.ip.att.net [12.123.16.209]
 17   190 ms   173 ms   190 ms  mdf1-gsr12-1-pos-7-0.dal1.attens.net [12.122.255.82]
 18   171 ms   179 ms   171 ms  mdf1-bi8k-1-eth-1-2.dal1.attens.net [63.241.192.202]
 19   180 ms   174 ms   172 ms  206.16.60.39
Trace complete.
------------
Tracing route to 206.16.60.39 over a maximum of 30 hops
  1     *        *        *     Request timed out.
  2    12 ms    10 ms    11 ms  10.201.0.1
  3    16 ms     9 ms    51 ms  213.243.153.129
  4     *       12 ms    10 ms  212.90.64.70
  5     8 ms     9 ms    12 ms  hls-b3-geth2-1-0-801.telia.net [213.248.78.161]
  6    22 ms    18 ms    18 ms  s-bb1-pos6-2-0.telia.net [213.248.64.101]
  7    33 ms    41 ms    27 ms  kbn-bb1-pos0-0-0.telia.net [213.248.65.25]
  8   128 ms   127 ms   124 ms  nyk-bb1-link.telia.net [80.91.249.24]
  9   121 ms   112 ms   134 ms  nyk-b1-link.telia.net [213.248.83.226]
 10   123 ms   121 ms   122 ms  att-112277-nyk-b2.telia.net [213.248.83.98]
 11   168 ms   168 ms   170 ms  tbr2031701.n54ny.ip.att.net [12.122.80.238]
 12   169 ms   170 ms   167 ms  tbr2-cl15.wswdc.ip.att.net [12.122.10.54]
 13   170 ms   174 ms   181 ms  tbr1-cl17.attga.ip.att.net [12.122.10.70]
 14   173 ms   172 ms   173 ms  tbr2-cl1835.attga.ip.att.net [12.122.9.158]
 15   200 ms   175 ms   179 ms  tbr1-cl13.dlstx.ip.att.net [12.122.2.89]
 16   170 ms   172 ms   168 ms  br2-a340s8.dlstx.ip.att.net [12.123.16.209]
 17   177 ms   174 ms   173 ms  mdf1-gsr12-1-pos-7-0.dal1.attens.net [12.122.255.82]
 18   171 ms   171 ms   174 ms  mdf1-bi8k-1-eth-1-2.dal1.attens.net [63.241.192.202]
 19   172 ms   181 ms   173 ms  206.16.60.39
Trace complete.
-----------------