# Simulation stops responding

**URL:** <https://get-help.theconstruct.ai/t/simulation-stops-responding/39883>\
**Category:** ROS2 Basics in 5 Days Humble (C++)\
**Tags:** bug\
**Created:** [February 5, 2026, 9:49am UTC](https://get-help.theconstruct.ai/t/simulation-stops-responding/39883 "2026-02-05T09:49:58Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![ricca2125](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/r/a8b319/32.png) [@ricca2125](https://get-help.theconstruct.ai/u/ricca2125)\
**Post date:** [February 5, 2026, 9:49am UTC](https://get-help.theconstruct.ai/t/simulation-stops-responding/39883/1 "2026-02-05T09:49:58Z")

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Hi, the issue appeared suddenly overnight, the simulation stops to respond to the keyboard comands and if i echo the topics nothing is published.

 ![Screenshot 2026-02-05 104526](https://get-help.theconstruct.ai/uploads/default/original/2X/2/234db47027d25f15f26c9ba4a5cbeb48511cd076.jpeg)  
not sure what it means, but on the top-left corner of simulation there are red square dots that before were green.

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**Author:** ![bayodesegun](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/bayodesegun/32/10684_2.png) [@bayodesegun](https://get-help.theconstruct.ai/u/bayodesegun)\
**Post date:** [February 5, 2026, 10:45am UTC](https://get-help.theconstruct.ai/t/simulation-stops-responding/39883/2 "2026-02-05T10:45:03Z")

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Hi @ricca2125  
I’m sorry you ran into this issue. Please take a look at the troubleshooting guide below to explore possible solutions:

- [How to fix an unresponsive simulation with red square dots in top-left corner](https://get-help.theconstruct.ai/t/how-to-fix-an-unresponsive-simulation-with-red-square-dots-in-top-left-corner/38962)

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**Author:** ![ricca2125](https://get-help.theconstruct.ai/letter_avatar_proxy/v4/letter/r/a8b319/32.png) [@ricca2125](https://get-help.theconstruct.ai/u/ricca2125)\
**Post date:** [February 5, 2026, 3:53pm UTC](https://get-help.theconstruct.ai/t/simulation-stops-responding/39883/3 "2026-02-05T15:53:38Z")

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Hi,  
i tried to open the simulation on firefox and to use a different network but that didn’t resolve, i disable the extension and clean the cache but didn’t work niether,  
but i resolved the issue by closing nordvpn app, it wasn’t connected but for some reason it interfered with the browser even if disconnected, probably is due to threat protection.  
thanks for the help, hope my solution can help

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**Author:** ![bayodesegun](https://get-help.theconstruct.ai/user_avatar/get-help.theconstruct.ai/bayodesegun/32/10684_2.png) [@bayodesegun](https://get-help.theconstruct.ai/u/bayodesegun)\
**Post date:** [February 6, 2026, 10:23am UTC](https://get-help.theconstruct.ai/t/simulation-stops-responding/39883/4 "2026-02-06T10:23:09Z")

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Thank you so much for letting us know how you solved it! We’ll update the troubleshooting material to cover that possibility.

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**Author:** ![system](https://get-help.theconstruct.ai/uploads/default/original/2X/9/9d3ce8305cc0d0d9b6e07d15767a6f245c526f1b.jpeg) [@system](https://get-help.theconstruct.ai/u/system)\
**Post date:** [February 11, 2026, 10:23am UTC](https://get-help.theconstruct.ai/t/simulation-stops-responding/39883/5 "2026-02-11T10:23:14Z")

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