During an EEVEE render if bloom is enabled lights will randomly pop in some frames of random position and colour, re rendering the frames that had the lights will fix the issue, but doing this is not a very feasible solution if there are alot of frames that need fixing.
Please find attached an example of a frame which has this phenomenon as well as a copy of the blend file. The scene in which the Blend file is creating there are supposed to be alot of floating lights (Blue) but there are certain frames in which similar looking lights of varying colour (as well as only appearing for 1 frame) appear, those are obviously not intended.
These flashing lights appear in any sort of EEVEE render even if the lighting is bright and there is no intention of any sort of floating fairy lights.
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 457.09
Broken: version: 2.90.0, branch: master, commit date: 2020-08-31 11:26, hash: rB0330d1af29c0
Worked: (newest version of Blender that worked as expected)
Short description of error
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Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]