Dropbox app running slow on Samsung S21 Android 13

hello. I am a long time user of basic DB. has been brilliant, easy to use and very quick. Last couple of days it is running like a dog. e.g Click on a folder takes 25secs to display, if at all, or click on Home tab get square with blue lines like "hanging", or click on xlsx file and doesn't open. I do use KeePass db on dropbox and recently upgraded that. However I reinstalled both DB And KP but problem still persists. To be honest it almost looks like a network problem but the phone works fine on everything else including the obligatory speed test. Any one have any ideas?