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[on:]

Hi, here's what's happening. When I connect my micro to computer it shows up, but after a while it disappears, and does not show again (as a different COM) as it used to. I've checked on other usb ports and computers.
What can be the cause of this behaviour? Something with bootloader?

[Reply #1 on:]

It also stop running last program, that i uploaded on it.
If it helps it also gets pretty hot (the chip and pins) when i try to run it off 9dc adapter.

[Reply #2 on:]

How long until is disappears?

Other than the 9v source, what else is connected?

[Reply #3 on:]

About 6 s, then it disappears and the onboard led stops blinking (on led is still on)

Midi socket, mono 3,5 jack socket, some switches (toggle and a footswitch, total of 5 pullup_input), RGB led (common catode), 10kpot and everything is in aluminum enclosure.
Both sockets had nothing pluged into them when it stopped working.

Before it stopped working, I was just tweeking part of the program which changed functions used with switches. It worked on usb but when i pluged 9v dc i had some issues. Last one of them was led turning on randomly and some tx, rx blinking.

[Reply #4 on:]

OK, case solved!
Unsoldering everything and holding reset button till upload starts worked. I uploaded blink, and now computer sees arduino on both temporary and permanent COM.