Two of the most irritating problems I had with HC was:
1. ALL web browsers would randomly crash--> auto shut downs that wiped all temp and open files in the browser. Stock browser was the worst, followed up by Opera, Dolphin, Mirix browser, and a couple other nobody apps. None worked flawlessly. This is enraging when you are typing an email and it dies, you lose all your work!!!
2. My bluetooth Motorola keyboard would stutter and die. Keys would stick, etc. Another maddening problem.
The ICS OTA I received did not rectify these two critical issues for me either. Hence why I invested time and energy into learning how to unlock the bootloader and install a custom ROM.
Those two problems that were unresolvable were deal breakers for me running anything from Acer.
I routinely sent alogcat files to Dolphin techie team. They were not able to deduce why their browser would auto-die during session. But hey, at least the Dolphin team responded and tried.
Opera support is miserable. I sent them what they wanted: their advice? Uninistall Opera and re-install. I did. Four times. Still problem persisted.
I would get SoD's on HC and my tablet was unrooted and unmodded at the time.
I would get SoD's infrequently on stock ICS, but enough it made me move to another ROM.
So to answer your question: Your device is not alone with these problems. Seems it is something in Acer's ROM's that do this. Some bug they dont bother to fix. And I assume it is in the stock ROM's, because I did factory recovery and factory wipes too, and it did not repair this bug with auto-die browsers and spotty bluetooth connectivity.
Go custom ROM. Flash an unlocked bootloader, install the latest greatest flavor you take fancy to, install either the Lightspeed 4.5 (i think they are up to 4.7 now...), Flexreaper RC1_v3, or that Thor ROM. All are good, I'm partial to Flexreaper cuz it has that totally customizable Acer Ring.
All those ROM's out of the gate are faster and have more clever apps in them than Acer-junk.