# Arduino crashes (goes back to setup) after few loops

**URL:** <https://forum.arduino.cc/t/arduino-crashes-goes-back-to-setup-after-few-loops/933993>\
**Category:** General Guidance\
**Created:** [December 9, 2021, 2:38pm UTC](https://forum.arduino.cc/t/arduino-crashes-goes-back-to-setup-after-few-loops/933993 "2021-12-09T14:38:57Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![JohnLincoln](https://avatars.discourse-cdn.com/v4/letter/j/7ba0ec/32.png) [@JohnLincoln](https://forum.arduino.cc/u/JohnLincoln)\
**Post date:** [December 9, 2021, 6:55pm UTC](https://forum.arduino.cc/t/arduino-crashes-goes-back-to-setup-after-few-loops/933993/12 "2021-12-09T18:55:47Z")

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Do you have a diode connected across _ **each** _ relay coil?

See [flyback-diodes-and-why-you-need-them](https://forum.arduino.cc/t/flyback-diodes-and-why-you-need-them/675409) for more information.

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