Note 9 slow charging issue

[katori142]

my note 9 is 7 months old. i always disable fast charge  and use normal charge feature and it usually takes about 2 hours 30 mins to fill up my battery which is ok for me. 

But recentlly it is charging very slow. 3 hours to go from %25-> %83 is crazily slow and i ve notice that whenever it charges slowly , i press lock button to wake screen up but there isnt approximate time remaining as usual. ( normally there should always be remaining charging time on lock screen.  And my phone is quite hot. it never happened before. my note 9 is exynos version. I ve tried rebooting, clear data.. vv but the issue still occurs and it seems to happen randomly. I m using stock charger and cable

Does anyone have same issue as mine? is it because the ambient temperature cause the issue ? my room temp is about 30-34 .C

Thanks everyone for reading.