# Simple LED flashing program bombs out after an hour or two

**URL:** <https://community.particle.io/t/simple-led-flashing-program-bombs-out-after-an-hour-or-two/1417>\
**Category:** Troubleshooting\
**Created:** [January 10, 2014, 6:24am UTC](https://community.particle.io/t/simple-led-flashing-program-bombs-out-after-an-hour-or-two/1417 "2014-01-10T06:24:04Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![naPS](https://avatars.discourse-cdn.com/v4/letter/n/76d3ee/32.png) [@naPS](https://community.particle.io/u/naPS)\
**Post date:** [January 10, 2014, 6:24am UTC](https://community.particle.io/t/simple-led-flashing-program-bombs-out-after-an-hour-or-two/1417/1 "2014-01-10T06:24:04Z")

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I wrote a simple program that simply turns a pin high, waits 1 second, and then turns it low, and waits another second. I flash it, works great, and then an hour or so later when I look at the spark core with the LED attached to the pin that I’m switching high / low, the LED stops flashing. If I unplug the core from USB and then plug it back in, voila, works great again for a little bit, and then stops working after a while.

Anyone else experiencing this?

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**Author:** ![PaulRB](https://avatars.discourse-cdn.com/v4/letter/p/848f3c/32.png) [@PaulRB](https://community.particle.io/u/PaulRB)\
**Post date:** [January 10, 2014, 6:32am UTC](https://community.particle.io/t/simple-led-flashing-program-bombs-out-after-an-hour-or-two/1417/2 "2014-01-10T06:32:25Z")

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Hi @naPS, what happend to the Spark’s indicator led when your program stops? Still breathing cyan, or flashing cyan?

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**Author:** ![naPS](https://avatars.discourse-cdn.com/v4/letter/n/76d3ee/32.png) [@naPS](https://community.particle.io/u/naPS)\
**Post date:** [January 10, 2014, 6:33am UTC](https://community.particle.io/t/simple-led-flashing-program-bombs-out-after-an-hour-or-two/1417/3 "2014-01-10T06:33:22Z")

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Looks like I should have read one more topic down from this. It’s flashing cyan, which seems to be the problem in the large thread that everyone else posted in.

I should probably delete this thread.

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**Author:** ![dorth](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/dorth/32/139_2.png) [@dorth](https://community.particle.io/u/dorth)\
**Post date:** [January 10, 2014, 8:48pm UTC](https://community.particle.io/t/simple-led-flashing-program-bombs-out-after-an-hour-or-two/1417/4 "2014-01-10T20:48:13Z")

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> [@naPS](#):
>
> It's flashing cyan, which seems to be the problem in the large thread that everyone else posted in.

Linked here: [Dropping the connection to spark cloud - #71 by nil\_orally - Troubleshooting - Particle](https://community.spark.io/t/dropping-the-connection-to-spark-cloud/766/71)

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**Author:** ![zach](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/zach/32/20714_2.png) [@zach](https://community.particle.io/u/zach)\
**Post date:** [January 10, 2014, 9:52pm UTC](https://community.particle.io/t/simple-led-flashing-program-bombs-out-after-an-hour-or-two/1417/5 "2014-01-10T21:52:29Z")

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Fix coming soon!

> **[Bug bounty: Kill the 'Cyan flash of death'](https://community.particle.io/t/bug-bounty-kill-the-cyan-flash-of-death/1322/2)**
>
> The latest commit on core-firmware’s master branch should fix the above mentioned issue: