Unity's Particle System - shader glitch (mesh vertices reduction)

Question

I have a problem on some Android devices with the particle system's rendering (weirdly enough the problem seems occur on devices with higher capabilities). The problem occurs when mesh based particles (Renderer/Renderer Mode/Mesh) are being rendered. It seems like the meshes that are being spewed out and slowly shrunk with time are being reduced ("reverse-tessellated") which results in a nasty visual effect. Does anyone know what might be the cause of this?

UPDATE: One thing that I've noticed is that with time - the longer the gameplay - this problem is getting worse.

UPDATE: What I've tried is to make one particle system bigger (around x5 times) in order to check if it will have any effect on it's rasterization. Normally particles are sized down from 1 to 0 based on their life-time. What I've noticed, after sizing them up, is that the problem does not occur anymore.

UPDATE: Visualisation of the problem:

Properly rendered:

Improperly rendered:

Answer 1

I was able to track the issue down. It turned out to be a problem within a toon shader I wrote while a go. All the things I've noticed are valid but unfortunately it took some time to put me on the right track.

Taken from Unity's documentation

The half and fixed types only become relevant when targeting mobile GPUs, where these types primarily exist for power (and sometimes performance) constraints. Keep in mind that you need to test your shaders on mobile to see whether or not you are running into precision/numerical issues.

Unfortunately for me, as it cost me quite some time, I've used half3/4 values with POSITION semantics which caused some numerical precision issues on some Android devices (in this case the particles were getting smaller and smaller - size 0 to be exact). As a general rule, from what I've read in Unity's documentation, float3/4 should always be preferred in conjunction with POSITION semantics.