From 3.0.6 Version To 4.2.4 Store Import Problem

Hi, I want to import from my 3.0.6 version website to my 4.2.4 version website. I arranged everythings and I started the processing. But When store import, liitle time is continue but suddenly stop. Especially when write updating data, is stopping.

I tried some things for example; I cleared from my 3.0.6 version, all customers, logs, and I optimized the database. Also on my 4.2.4 version, config.local.php I changed memory limit changed and I increased. My server checked the server cache and

I Have that

[size=3][color=#000000]Intel® Core™ i7-3770 CPU @ 3.40GHz[/color][/size]

[size=3][color=#000000]Speed[/color]

[color=#000000]3430.171 MHz[/color]

[color=#000000]Cache[/color]

[color=#000000]8192 KB[/color][/size]

[size=3][color=#000000]I sent an email to cscart support about my problem also ı have support credit now. But the support team don't reply me for 3 days. [/color][/size][color=#000000]I don't know what can ı do now. [/color]