Hi Pithuda!
Firstly, welcome to the forum.
Secondly, I do not think your file (with given inputs) should be negated at all. Yes, it could mean longer time for the checks etc. (given your travel history) and now that additional time period is also over, you should be hearing the good news of your PPR very soon! Have faith in God and keep it to the highest level!
Thirdly, Revamp your Outlook towards life to be positive than the contrary!.
Life is always full of water, honey, milk and syrup rather than devoid of that! . At the most, write an email inquiring your visa Officer for the status of your file, but politely and cheerfully! Do not write something like " are you going to give me the PPR or are going to reject it......!" Please do NOT write like this! It would be preposterous as if you are pushing the VO to do something drastic!
Your statement/queries
"Is that normal or should i start worrying about this about my application being rejected? If not now, when should i start worrying? " compelled me to caution you for your betterment and sincerely hope that you will take this as very very positive. Get solace from my timeline (almost similar) and Start living my friend and Stop Worrying (now does that sound like a
Dale Carnegie authored book? If yes, then be happy and Enjoy!!
Best Wishes!
Bestpal