# Device lockup question

**URL:** <https://community.particle.io/t/device-lockup-question/55940>\
**Category:** Firmware\
**Tags:** photon\
**Created:** [May 1, 2020, 12:03pm UTC](https://community.particle.io/t/device-lockup-question/55940 "2020-05-01T12:03:54Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Elco](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/elco/32/3234_2.png) [@Elco](https://community.particle.io/u/Elco)\
**Post date:** [May 1, 2020, 3:03pm UTC](https://community.particle.io/t/device-lockup-question/55940/4 "2020-05-01T15:03:55Z")

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Is heap fragmentation a thing on the photon? FreeRTOS Heap 4 should not be affected, but I don’t know which heap is in use here.

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