Hello, please help me

Hello form Macedonia, dear friends.
Could someone of you please help me?
I have problem wit limited connectivity on my laptop (Samsung) but also on my iPhone 4 and my wife`s LG 5 duo all at the same time. I changed yesterday my router speedport which performed wireless connectivity problems, with a same one- and the problem is actually the same.For every 30 minutes I have limited access on my laptop, iPhone 4 and LG 5. If i restart the router it is OK for a while, and then again the same story. Someone told me to switch off wireless option on both phones, which made connectivity normal on my Samsung laptop.
I repeated, I changed two routers and the problem persists.
I will be highly appreciated if someone helps me to resolve this issue
Thanks in advantage,
Armend

Dear Armend, try going into your router's page and check the number of objects that can use the internet at a time

Thanks sri2000, but can you please be a bit more specific?