The 90-day report requirement reminds me I've been home too long! So why don't you take a weekend in Singapore. You'll enjoy some great food and then reset the Thailand clock. Win-win!
I've used Agoda for 4 flights/hotel combinations this year and everything worked great. Definitely appreciated the cheaper price than I found separately. It's a site that's my first stop when thinking about a trip.
You might also consider using a desktop computer to access. I personally have not had any trouble accessing any of my homeland websites directly. I know some websites have a special access via mobile and I sometimes have trouble with those.