Help with RTC Clock module!!!

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i have got rtc clock module, have problems need with. have conect arduino there sda pin on a4 , scl on a5. use libary rtclibmaster, , exemple there set time , date. wrote little code time on lcd screen, problem when set time 20-30 second late, , when pase 59 second started count 10,20,30,40,50,60,70,80,90 , after started count normaly again 1,2,3,4......  on second. last problem wount remember time when shutdown power, when cut power , put on start time there started time last time upload code, not remeber. have tested conection battery, , battery 100% new. please me, have plan make fun , not easy when wont work :)

thanks!!! :)
ps: sorry bad english :)

which rtc module?  coin battery?  have pull-up resistors
built in?


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