75% loss when 2 WAN connections are connected

Hi,

I'm testing at the moment with 2 lines connected to the lan ports. everything runs fine as long as 1 only connect one DSL line. but there seem to be quite some problems when i connect the 2nd line.

traffic stops and about 75% gets lost as soon as the other line is in use,
i have tried the following:
booting the RED with 2 lines
booting with 1 line and plugging a 2nd one
connecting a 100M fiber and a DSL line
connecting the RED to another ASG.

reds50 [50] dstport: 3410 keyid: 1 alg: authenc(hmac(sha1),cbc(aes))
0 weight: 1 remote: 80.101.83.7 (dev 3) delay: 2504.67 ms
RX: miss 3942/23262
TX: miss 0/26896
1 weight: 1 remote: 81.205.172.166 (dev 3) delay: 1006.48 ms
RX: miss 12169/71283
TX: miss 1/41077
Total RX: miss 0/0 bandwidth 0.0 bit/s
TX: miss 0/0 bandwidth 0.0 bit/s

Any ideas?