running out of memory on loop image generation

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Hi,
I used the following code in a loop generation plots:
```python
style = mpf.make_mpf_style(base_mpf_style="yahoo")
adp = [mpf.make_addplot(re["EMA10"], width=1.5, color="#4c8fb9"),
mpf.make_addplot(re["EMA30"], width=1.5, color="#679e64"),
mpf.make_addplot(buy2["HA-low"], type="scatter", marker="^", markersize=100, color="g"),
mpf.make_addplot(sell2["HA-high"], type="scatter", marker="v", markersize=100, color="r"),
]
mpf.plot(re, type="candle", style=style,
title=f"BOT{b} {symbol} {timeframe} {datetime.now().strftime('%Y-%m-%d %H:%M:%S')} {Algorithm}",
addplot=adp,
volume=False,
# ylabel=symbol + " - " + timeframe,
savefig=dict(fname=filename, dpi=150, pad_inches=0.50),
)
```

It runs every 15 minutes and iterates "n" times depending on how many source vectors are available, let say from 50 to 300, but the real number of plot generate are 5 to 10.
It worked fine for hours but suddenly I got the following error:

```bash
Job "scannow (trigger: interval[0:15:00], next run at: 2021-12-16 02:45:05 CET)" raised an exception
Traceback (most recent call last):
File "/home/pi/.local/lib/python3.9/site-packages/apscheduler/executors/base.py", line 125, in run_job
retval = job.func(*job.args, **job.kwargs)
File "/home/pi/deve/deve-Multi.py", line 331, in scannow
mpf.plot(re, type="candle", style=style,
File "/home/pi/.local/lib/python3.9/site-packages/mplfinance/plotting.py", line 765, in plot
plt.savefig(**save)
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/pyplot.py", line 958, in savefig
res = fig.savefig(*args, **kwargs)
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/figure.py", line 3012, in savefig
self.canvas.print_figure(fname, **kwargs)
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 2314, in print_figure
result = print_method(
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/backend_bases.py", line 1643, in wrapper
return func(*args, **kwargs)
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/_api/deprecation.py", line 412, in wrapper
return func(*inner_args, **inner_kwargs)
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/backends/backend_agg.py", line 540, in print_png
FigureCanvasAgg.draw(self)
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/backends/backend_agg.py", line 431, in draw
self.renderer = self.get_renderer(cleared=True)
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/backends/backend_agg.py", line 447, in get_renderer
self.renderer = RendererAgg(w, h, self.figure.dpi)
File "/home/pi/.local/lib/python3.9/site-packages/matplotlib/backends/backend_agg.py", line 93, in __init__
self._renderer = _RendererAgg(int(width), int(height), dpi)
MemoryError: In RendererAgg: Out of memory
```

should I release the memory closing the plot in such a way? How?
thanks

Start by reproducing the provided Python loop and trace mplfinance/plotting.py at line 765 through Matplotlib savefig and RendererAgg. Compare the repeated plot-generation behavior with the reported MemoryError and establish a reproducible test or documented resolution for the out-of-memory failure.

Written by the indexing model from the issue text.