Stove is 1 season old and is losing heat

I bought a new Hampton H200 wood stove last season and it worked great.

This year (October) I fired it up and i noticed it was drafting waaaay too much it was not throwing any heat. I had all the gaskets checked by the dealer. They tightened the door checked the pipe connection and the drafting lever at the bottom. I then put a thermometer on the top to monitor the temp and it still does not get out of the "too cool" zone even after an 8 hour burn. I have been back to the dealer multiple times and they are telling me the manufacturer needs to now inspect it. Could I have over burned it during season one and done damage that they cannot detect ?
PLEASE HELP .....
Freezing in Boston

My chimney is standard size chimney. The house was built in 1991. I'm using a mix of wood that's been seasoned for 18 months -2 years.....Oak, birch and maple. When I first bought the unit I did not have a thermometer on the top. It wasn't until this season that I got one because we were trying to trouble shoot and needed a temp check. I have to admit that it was burning pretty hot at first ...but I can't say the actual temperature. I was not aware of over firing until researching a bit. Even then, this is a new stove by a reputable company and dealer. I had it cleaned for the first time in the fall and then the issues started. I thought that the chimney sweepers may have damaged the liner or something but after inspection from the installer I'm told "no damage to the unit or the liner. " Everyone is scratching their heads and can't figure it out...I've been waiting for the manufacturer to contact me (through the dealer). I'm going to go for a warranty replacement. Very frustrating.
Thanks for feedback.

Fsappo....the dealer did start a fire ..with my wood. But this was to check the seal on the door ( that he tightened) and the drafting unit ( which still does not appear to be working as efficiently as last season) the only structural change is that the chimney sweeps put an additional cap on the chimney top..next to the liner top. So now I have two caps side by side.

Hogwildz said:

Are you turning the air down after getting the load in an established burn?

Click to expand...

Yes... I'm working it. I burn for 5 hours and still no temp change

jeff_t said:

'....seasoned for 18 months-2 years' means different stuff to different people. Did you split and stack it yourself? Did a seller tell you that's how long it was seasoned? And that ain't long enough for oak, at least not in my almost-perfect-for-the-Midwest drying location.

'Dry' is something that can be defined, generally ~20% or less on a moisture meter, on the face of a freshly re-split split.

For 99% of the complaints here about not enough heat, it's the wood.

Click to expand...

The seller said the wood was seasoned 18 months.... In addition I had wood stacked that was over two years old and used that as well. Where can I get a moisture meter?