Fail to allocate bitmap

Hello,

I have the following code that systematically ends up in the following error after 396 charts are saved.

**Fail to allocate bitmap

Process finished with exit code -2147483645**

I tried several combinations including with plt.close all or plt.close of the figure.
I tried with jpeg and png extensions
Although the memory does not seem to be cleaned up ( linear growth ) it does not seem to be the reason since it can fail with plenty of memory left to allocate.
I checked that it was not some kind of murky limitation of the disk, by moving the creation of the file to an NVME disk.
Also updated my graphic card drivers, because why not.
As you see I also tried to reload the module every time in the loop ( desperate move :) )

Really not sure what I am doing wrong here

I updated mplfinance to 0.12.7a17, matplotlib to 3.4.1.
Python version 3.9.2

for index in df.index :
    try :
        reload(mplfinance)
        i=i+1
      
        titleString =(df.iloc[index]['TimeStamp']).strftime('%Y-%m-%d')+' '+(df.iloc[index]['Symbol'])
        print ('processing  '+   str(index)+ ' ' + titleString)
        minRange = df.iloc[index]['ChainPosition'] - chartingDayAddition
        maxRange = df.iloc[index]['ChainPosition'] + tradeDuration + chartingDayAddition

      
        prices = pd.DataFrame(get1dDB().aggregate(pipeline=[
        {
                '$match' : {
                    'Symbol' : df.iloc[index]['Symbol'] ,
                    'ChainPosition': {
                        '$gte': minRange.item() ,
                        '$lte': maxRange.item()
                             }
                        }
         }]))


        BuyLine = prices.loc[prices['ChainPosition'] == df.iloc[index]['ChainPosition']]
        SellLine = prices.loc[prices['ChainPosition'] == (df.iloc[index]['ChainPosition'] + tradeDuration)]

        vls =[(BuyLine.TimeStamp).iloc[0].strftime('%Y-%m-%d'),(SellLine.TimeStamp).iloc[0].strftime('%Y-%m-%d')]

        prices.set_index('TimeStamp', inplace=True)
        fig = mplfinance.plot( prices, type='candle',volume=True, title=titleString, savefig=dict(fname=detailsPath+titleString+'.jpg', dpi=150), closefig=True)

        plt.close('all')
    except :
        print ('error')

Start by reproducing the reported loop using mplfinance.plot with savefig, closefig=True, and plt.close('all'), checking behavior around the 396th chart. Inspect the matplotlib and mplfinance plotting and bitmap-saving entry points involved in that path. Done means identifying the cause of the allocation failure and establishing a confirmed fix or documented limitation.