Can't Drag & Place Items from Sim Inventory

I am experiencing issues with dragging items from inventory. It does not happen all the time, but I am unable to determine the trigger. So far affected items are flowers and produce, seed packets, cat toys (mouse, bird, and wand), crystals, snow globes, photographs, soccer balls, trash piles, and books. It seems to occur spontaneously-- I was able to drag one rose from a stack to a pot but none from the same stack immediately thereafter and all other plants fruit and flowers in that sim's inventory became undraggable at that time.  Not all affected items are always affected when it is occurring i.e., sometimes it is all the plants in the sim's inventory and sometimes just some plants. Stacked or not does not seem to be a factor. I have been unable to drag from a stack or drag individual items from within a stack. Once one sim is affected, other sim on same lot also affected so likely not sim specific.

To be clear: hovering over item in inventory-- single or stack, and pinch hand (index and thumb extended cursor icon) does not change to grab hand (closed fist cursor icon) on mouse click, though item box will change to grey state, and item cannot be "dragged" out of inventory. 

Going in and out of Build/Buy mode seemed to fix it once but not again when it reoccurred (numerous follow up attempts). Leaving the lot seemed to fix a couple times but not every time. Logging out then back in seems to always resolve this problem but it does not stay "fixed" for long. Upgrade parts, dyes, cardboard dance floors, and soy wax do not seem to ever be affected.

I have spent way too much time trying to narrow this down with two sims whom I can consistently recreate this fail and I may return with more results from other sims and other items but hopefully this helps point someone in a useful direction.

PC via EA app, no CC nor mods ever.