Missing data when the email was sent

Hi Team,

Thanks for this great plugin.

Recently I noticed an issue in one of my form. Issue is that, data is missing when the email was sent.

The form contains 135 input fields(Out of which, 7 are type ‘text’ and rest are of type ‘number’). There are some calculations to be do before sending mail. So what I did is create a text area in form and put that inside a hidden div, so that it is not visible to front end users. Upon submission, calculation are done using JavaScript and insert the result in textarea(Note that it is not just a number, but a series of text and numbers and also it is some what large content). And put that textarea name in mail body session of contact form.

When I fill all data in form, it is noted that some datas are missing in mail. But when I enter few data then mail received with full data(which is what I need).

While Googling I found below thread

“Some users experienced missing data when the email was sent. Random fields were not included in the email. After much research, I concluded this must be due to the size limitation of a cookie. Browsers generally limit the size of a cookie to 4,093 bytes which is roughly 4,000 english characters, which is roughly one typed page double-spaced. “

Can you please let me know is that the issue?
If yes how can I solve?

IF no, then what is the exact issue and how can I overcome this issue in ContactForm 7?

I am eagerly awaiting your quick reply on this.

Thanks in advance.