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Hello and thanks for your question. My name is ***** ***** I will do all I can to help.
One thing I want you to try next time this happens, when you get in it to start it, after it's running, and you verify the heater is inop and the windows don't work, Turn the heater ON, to where it normally would work, and just barely twist the ignition key slightly a few degrees, not enough to grind the starter of course, but about 4 or 5 degrees twist it back and forth and see if the blower motor comes to life and starts blowing when you do that. Let me know what happens.
All of these accessories are tied to IGN. switch power so my thoughts are the electrical portion of the ignition switch is worn out.
My theory is that the ignition switch contacts are worn, and going over a bump or turning the vehicle a certain way may move the key in the switch just enough to make contact. If you perform that test, where everything doesn't work you described, and leave the heater on and turn the key in the switch and it comes on. That would be a good indication of the ignition switch being worn out.
Can you try that test and let me know if the heater comes to life after twisting the key a little?
Any luck trying that test to see if it helped? thanks.
I have some other things to look at if that test didn't work. Thank you.