based on the pic provided.. i dont have enough info to go on.. to offer suggestions ...

if its a houseplant. maybe someone in that forum might have a guess ...

can you give us any more facts.. like its potted and you just brought it in for winter.

just repotted;

recently placed in sun ...

its an old plant.. etc ...

something to speculate on ...

my first thought is a watering problem.. but also.. older leaves that should simply be cut out.. since the center growth is lush... and its that season.. when the sun is in decline.. when older used up leaves are shed ...

ken