The link below might be of some help. Seems there's a couple of threads going on.
A possible answer has been suggested by someone. Waiting to confirm my side by that might be a little way off. Same problem as found in this thread.
I'm beginning to think it's the HH2 that is not up to the job.
Most who change out to a decent specification Router seem to get a result.
Watching with interest. 😉