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I have had this happen every once an a while with apps that are memory intensive. I think the built in task killer is killing the launcher to allow the app to run better. What apps cause the problem?
Do what I did, abandon sense and 2.1 altogether. Phone runs much nicer without lag.
[ROM] CyanogenMod-6 for Hero CDMA - V6.0.0-RC1 (08/15/2010) - xda-developers
or if you want a lightly themed version:
[ROM] (UPDATED 21-AUG) FroYo 2.2 - CM6 Extremely Blue AND Vanilla (unthemed) Versions - xda-developers
For chapulincolorado (classic), rooting is the way to go, just do a lot of reading throughout the forums before doing it and there are plenty of ROMs to enjoy (I'm currently using Honeybun, it has HTC Sense 2.1, no lag at all).
I'm not very technical at all, just understand basic computing and as long as you follow step by step on the instructions, is easy.
rufflez, it seems you're a legend in these forums, nice to see you everywhere, your knowledge precedes you.
Being a newbie, what does vanilla mean? I see this everywhere, I think is plain android, but not sure. Also, what does Blue mean? First time I see it.