In my case, I DO NOT watch 3 hours of HULU+ in a sitting. The HULU+ app problem occurs every single time I use it. After only a few minutes of use. And although there are lots of threads perhaps, it hasn't seemed to lead to any fix to the problem. I'm not really sure where to direct this concern and get some kind of results. And I can't tell if anyone who might be able to do something cares enough to do so. The problem's been around quite some time.
The place to direct your concerns is to Hulu. They own the content, they wrote the channel and they maintain the channel.
Roku does, at times, contact channel owners about bugs and the will, also at times, provide assitance but they do not write the channels and they do not maintain them.
I am sure that Hulu has been made aware of the reported issues and I am also fairly sure that they have looked into it but, and this is just a guess, I also believe they cannot replicate the problem with any degree of consistency.
Personally I wish Roku did take a bit more of a part in fixing bugs it at least the major channels but the mostly hands off policy is one of big strengths of having a mostly open channel system however it is also a weakness.
There is a bug in the Netflix app where it forgets what position the queue was in and reverts to position 3 at times only on Roku 2 devices. That bug has been around for about a year but it has never been fixed and it has not even been acknowledged as a bug by Netflix but there are several users that are having the issue. If Roku had control of the code I believe they could fix it but they don't and it still is not fixed. Your problem is, probably, no different. Roku probably "could" fix it but Hulu either can't or won't, or cannot reproduce it.
My bugging of Netflix about my problem has had no effect but I hope you, and others, bugging Hulu about this problem might; at least it can't hurt.