Is there a maximum number of child?

[alnassre]

Good morning

Im using custom field / Plug-ins of type Stockable variants for creating childs products.

here I have a parent with 106 child, and the problem started when I'm now trying to save any change on the parent is not saved.
it's just redirect me to virtueMart dashboard.

What's the closest thing that cost this problem?
is there any limit?
or apache performances needed?

I was thinking that the max_post_size is too low so I change it to 64M